Worried

So last night my boyfriend and I were gonna have sex like usual. He started out by eating me out and I definitely climaxed, but I've never came before. Then we started going at it (without a condom) and he pulled out before he felt like he was gonna come, but when he did there was white cum on his tip. He seemed convinced it was my cum because he said he'd seen his cum many times before and it didn't look like that. I thought I had climaxed previously while he was eating me out. So should I be worried about possibly being pregnant???