Not sure if he came..

I'm 16 years old and had sex for the first time yesterday. When my boyfriend pulled out, there was white like substance that looked like cum, coming out of me. We used a condom and he went to check if he came at all and he said he didn't, it must of been me that "cummed". I did feel something inside of me like I did. I'm not sure, I don't know, please help. Any one??