Pregnant by fwb?

I've been with this so called friend with benefits for a good 7months. We are both divorced. I have no kids. He has a three yr old with his ex gf. We both enjoy being together. We're in contact almost everyday. I am affraid that I might be pregnant. I have also developed very strong feelings for him and not sure how to tell him about my feelings as I don't want to ruin what we have. Also waiting to take a pregnancy test and No he doesnt want anymore kids anytime soon. Protection protection I know:(