Don't know if I'm pregnant or not.

I've been with my boyfriend for 6 months. 6 months isn't really a long time but in those 6 months we've become very very close. we have a pretty good relationship. 
About a week ago we had unprotected sex 😴 I don't know why I let that happened. He pulled out but I don't know if he pulled out in time. He said he did but I feel like he's only saying that because he knows I would kill him if he said no. 
I went to the bathroom and cleaned myself but still.... I'm not sure if he pulled out on time. 
My period is suppose to be coming in 5 days and this morning I woke up with cramps. they're not terrible tho. I went to the bathroom & saw a little bit of blood. My flow is usually pretty heavy but this time it was just a little bit of blood in one area. 
I haven't had any other signs of pregnancy such as Neausea, food cravings , etc. I have been pretty moody tho but that's it. 
I don't know if I should be worried or not. I'm not ready for a baby. and I know my boyfriend isn't ready for one either. 

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