CAN I STILL GET PREGNANT THAT WAY? Please help, very worried.

Jenn
Okay so my boyfriend and I never use protection. He always pulls out. He and I are not ready for a kid but if the chances for me to be pregnant were possible, we wouldn't consider it a huge issue.
BUT
What if he pulls out and we go for round 2?
Is there any possible way he could of not wiped/cleaned himself right and there could've been some cum while round 2? 
Or can pre-cum also get you?
All I know Is that for 2 days I've been feeling pressure below my abdomen, like if I'm laying tummy-down, I feel like I'm laying on top of something when nothing is there. I'm waiting for my period to start which should be now. 
I'm just hoping its period symptoms.... 

Vote below to see results!