should I be worried?

So basically I had sex for the first time ever with my boyfriend on april 6th and we had protected sex (used a condom) and i did bleed quite some ; like basically during sex and 2 days after it was just light spotting. now after that we basically once every week for the past three weeks (one being 3 days ago) and each time we had sex for about 3/4 times and it was mainly unprotected sex and he just pulled it out (mind you im not on BC nor took plan b). now i was supposed to get my period the 16th of april but its now the 29th and i still didn't get my period. i am kinda worried but i am not having pregnancy symptoms i am actually mainly having my period symptoms aka tender boobs and i feel hungrier. also my periods are usually regular but they are very weak (for example they last 4 days with barely any blood). now my question is, is there any possibility that i might be pregnant? or is it maybe just the fact that i had sex for the first time delaying it all? (mind you I did start eating way less these past 2 months and being very stressed from work as well as from me thinking im pregnant)