HELP!!!!!!

Courtney
Ok I know this is bad, and people won't like it but please just Be supportive and give advice.
I'm 15 and my boyfriend is 16, we have been having sex for 3 months quite regularly, I'm on the pill (progesterone only) and I mucked up my medication once but we don't use condoms either I know that's bad. Neither my parents or his know what we are doing, but I'm scared because I haven't got my period, and my boobs have been really sore to the touch, please tell me I'm being paranoid and I'm not Pregnant