Am i pregnant? I and my bf had protected sex, he used condom and later he ejaculated on upper part of my body ?

I and my bf had protected sex, he used condom and later he ejaculated on upper part of my body n right after that I wiped the semen with tissue n later had shower. a week after I had my periods bleeding for 3 days. now I have frequent stomach aches does that mean am pregnant? its been 12 days since we had sex. am freaking out! help!