Just Assure Me That I'm Okay. Please.

My boyfriend and I had sex on like October 29? He always pulls out, always, always, always! And I take my birth control around the same time every night. So my chances are slim to none of getting pregnant. And I don't have sex during my "most fertile" window. But my period is so weird right now. It's so light! And I've have severe cramping. I'm worried it could be implantation bleeding. You know? Am I just crazy? 
(We also had sex last night, while kind on my period. And tonight. But he didn't finish tonight at all. And he pulled out on time last night) tell me I'm crazy. Please. And I'm okay.