Not necessary you could have a vaginal desease or infection. The only way to find out is to check for pregnancy symptoms or get a pregnancy test.
You need to call your doctor.
Yes. It may mean that you are in the process of losing the fetus and it could be a sign of ectopic pregnancy. You should call your doctor.
If you are at 36 weeks pregnant and having sharp vaginal pains, it could be caused by the cervix dilating. This can happen days or weeks prior to actual delivery.
If you are infertile you can not get pregnant and I'm not sure what you mean by vaginal infertility. When you have your period you can get pregnant too although it is rare.
Hunger pains? No, nothing you mentioned points toward being pregnant.
You are not pregnant. The pains could be caused by something you ate, etc.
Go to a doctor.
No, but it might mean that she has a stomach virus, or she is starting her period.
Not a normal sign of pregnancy.
sometimes you may experience breast sorness, vaginal pains, stomach pains, lower back pains and few others.
I would give your Doctor a call to be on the safe side. I wouldn't be especially concerned unless your experience severe abdominal pains or vaginal bleeding. But do contact your Doctor.
Having vaginal discharge does not prevent you from getting pregnant. It will not expel the sperm. It is not a way to determine whether or not you are pregnant. You can have discharge at any time, pregnant or not.