I'm 16 years old. I haven't had sex in about 6 months. I have an app that tracks my period and it's pretty much accurate. my period, according to the, is 4 days late which is really weird. but I woke up a morning and there was blood on my pantie so I assumed it was my period so I put on a tampon and went about my day. about 2 hours later, I wanted to take a shower so I took out the Tampon and there was no blood. I'm a little worried because i haven't had any intercourse in 6 months so how could I be pregnant but this is a little strange to me.