i started taking the pill in October, but i was on two different antibiotics so the pill wasn't effective. and I've been on my new dose of bc pills this month, but i haven't finished the dose yet, so im afraid its still not effective. on November 21st i had unprotected sex, he pulled out. And i wont get my period until this Thursday or Friday. But I've been experiencing head aches and stomach pains.. im not sure if there just period cramps or what. and i don't know, am i just paranoid and making myself sick over it? or could i really be pregnant? i think its too soon to be experiencing these kind of symptoms.. i started feeling like this 2 days after it happened