Stomach hurts after unprotected sex

So my husband and I just had sex and  we don't use a condom as I have been using birth control pills(the 3 month one, and I have been taking t the exact same time each day, and haven't missed a day.) 
My daughter is 17 months old, we are not planning on having another child for quite awhile (at least 5 years maybe even 10) 
Anyways, my stomach hurt right after my husband and I had sex. It felt almost like cramps. And it is still hurting(20 mins later) Could this be a sign of early pregnancy? I am really worried. 
.. I'm going to sound stupid but could he have JUST gotten me pregnant? Is that what the pain is from? 
Took a Pregnancy test and negative(though could be early).
Edit : he cums in me daily but this time it hurt my stomach