No, what is being expelled needs to be allowed to pass.
Tampons dry-out vaginal tissues causing ulceration, giving TSST-1 toxins responsible for TSS a more direct route into your body - using too high an absorbency increases damage so increases TSS risks. During menstruation you know your flow pattern to know what absorbency to use, during miscarriage you don't know how much blood you're going to lose and thus may use too high an absorbency so increase risk of TSS.
Tampons are a major cause of vaginal infections, during miscarriage you are at higher risk not only from vaginal infections but of those infections travelling further-up your vagina into the uterus where it may lead to a far more serious infection.
No, tampons should not be used a few days after a miscarriage and there's no reason to use tampons as you will not be menstruating at that time. During miscarriage tissue from the pregnancy needs to be expelled, the cervix is more open so you're at higher risk of infection and TSS - thus using tampons would be very dangerous. If you still have bleeding then use pads or period underwear.
There are no ill effects from using a tampon for bleeding from miscarriage, whether or not you knew you were pregnant. You can use tampons or pads for this bleeding. If bleeding is extremely heavy, pads may be easier.
Yes, you can use tampons after a transvaginal scan. As always only use tampons during menstruation and always follow precautions to reduce risks of TSS and vaginal infections.
Tampons wouldn't affect a baby during pregnancy, but there is absolutely no reason why a woman should be using tampons while she is pregnant - tampons should only be used during menstruation, even if experiencing bleeding during pregnancy it is not safe to use tampons as you don't know the blood loss to know what absorbency to use. Misusing tampons this way can increase risk of vaginal infections and toxic shock syndrome - the latter would potentially cause serious harm to the baby.
Tampons
Tampons are inserted into the vagina during menstruation, using lowest absorbency. If you want to use tampons then you will find instructions on the packet on how to use tampons correctly. You can also look online for videos that will show you how to insert whatever type of tampon you want to use.
Some men can use tampons, but not cis men.Some men are born with a vagina and a uterus so will menstruate, thus they may want to use tampons or other menstrual products just like women. Some men will also use tampons for first aid, tampons are the perfect size and shape to insert into your nostrils during a nosebleed.
A woman should NEVER use tampons when not menstruating - thus a pregnant woman wouldn't be using tampons to begin with.
You can use tampons a week after a D&C. Until then, no sex or tampons.
People wear tampons as a means of managing menstrual flow during their periods. Some people use pads, some people use tampons, some people use menstrual cups, and some people use nothing. People wear tampons because that is simply their preferred method to deal with menstrual flow.
No, you don't have to wear tampons during your period. Most women start-off using pads, also if you use tampons or sponges you have to use pads as it's not safe to use tampons or sponges overnight, with light flow or throughout your entire period. You can use menstrual cups or softcups which don't require you to use pads at all, or there are options such as menstrual release that require nothing.
Tampons can only be used during menstruation. During menstruation you know your flow pattern to know how much blood you are losing on any given day, where as after miscarriage or abortion you have no way of knowing how heavy or light bleeding is going to be. Tampons dry-out vaginal tissues causing ulceration which can be painful but which also give TSST-1 toxins responsible for Toxic Shock Syndrome (TSS), using too high an absorbency means more damage so higher risk - with no idea how much you will bleed you may use too high an absorbency. Tampons risk vaginal infections. Tampons prevent vaginal cleaning, effect vaginal pH, encourage bacterial growth, and contain harmful ingredients that effect vaginal flora - thus higher risk of vaginal infections such as Bacterial Vaginosis. After miscarriage or abortion your cervix is more open, thus there's higher risk of vaginal infections travelling further-up into your vagina, this puts you at higher risk of serious infections and pelvic inflammatory disease. It is important to allow the tissue/foetus/embryo/zygote/placenta/uterus lining to shed during miscarriage or abortion, keeping it inside your vagina is not healthy.