So I was supposed to start my period the 15th. I had sex on the 8th. And I took a test on the 23rd. And it was negative. But I'm still late. I'm worried. I've been having cramps slightly not much for the past couple days and I've been gassy like I normally am before and during my period. I'm 17 and I can't tell my mom because if I am pregnant I'm gonna disappoint her and I'm not ready to tell her. She was pregnant at 17 and so was my sister. I have tried so hard to not follow in their footsteps and this is my first time. Someone please help me. ​