burning sensation and stomach pain after sex

OK so here it goes...
i got my period this month on December 31st and i believe it was a normal period. during my cycle i felt my usual signs of ovulation but today when I had sex, i had intense pain afterwards in which it was hard for me to stand up. when i tried to go to the bathroom a burning sensation occurred and a pain in my stomach became unbearable. as well i can not poop and when i tried to a pain radiated throughout my back and stomach.

could any of this pain be because i might be pregnant?
i got birth control pills yesterday but my gyno told me i cant take them till the sunday after my period begins.