Oops....

So long story short I met this guy through work. We started talking a couple months ago and on father's day we ended up having sex. And every Sunday since.... We always start out without condoms and then he outs one on. He's never came inside me but let's be real, PRECUM. Well I'm an extremely regular person when it comes to periods and I'm now late a week.... Mind you I have an 8 month old... I don't want another right now and how the hell do I go about talking to him about my worry.... He's the first man that has touched me since before I gave birth.... Big oops...