after your first time having sex*
Also note you may bleed after the next couple times, too.
Yes, it is normal to bleed after sex. It can last a few days, but if it gets heavier rather than lighter, see a doctor.
i know but it is normal to have a little bit of blood in mucus after right?
Your body is reacting to sex. Please be aware that you need to see a doctor regularly - a gynecologist. If you have sex, understand boys are clueless about cleanliness. If you don't make sure they are clean of body and hands, you will end up with discharge that smells bad because your body can't handle the bacterial and fungal load that his different anatomy can. So if you can't go to the doctor without your mom's participation, it can get complicated for you.
Sometimes condoms fail or there can be transfer of sperm by poor techniques, yes. You have to buy a pregnancy kit to find out. Read the instructions. I do wish schools gave health education like when I was in school. We knew what we were getting into and could make informed decisions.