For one make sure you're using correct absorbency - if your flow is light you should't be using tampons at all. Your cervix may be sitting lower than it was previously. If concerned then go talk to your doctor to determine the cause of the pain.
The last day or so of your period may just be so light that you are no longer passing the blood from the uterus but also the clear discharge from glands in your vagina or mucus from your cervix that is colorless.
Yes. Unless you are on a period you shouldn't be using a tampon and if you are you need to change it several times a day. The bacteria is what causes the TSS and it can kill you. I hope you have stopped doing this.
You were only spotting for not even a full day and having some bad cramping?
If you wear a tampon then you can. =]
It's not unusual for the amount of flow from your period to vary from hour to hour or day to day. This is a common pattern that women report.
If you are pregnant, sometimes it does that, Have you been sleeping with someone lately?
Ovualtion time! Some women experince cramping on ovualtion day.
If you're experiencing light bleeding then you shouldn't be using tampons at all because this increases your risks of TSS. I'm not sure what you mean by causing bumps, tampons go inside your body and unless you regularly examine yourself wiht a speculum you'd not be able to see any bumps inside your vagina that could be caused by tampon use.
If you have had sex, then you can be pregnant. However, it sounds more like your body is getting ready to start your period.
Not necessarily. Cramping can be from many different things, including gas in the large intestine, ovulation, and menstruation.
You were proberbly just late ,maybe due to stress