Contractions

Da

So I'm a FTM and I know this probably seems like a stupid question I'm 39 +2 and I've felt the stomach tightening up but my question is does your whole stomach tighten up or like a section at a time because I'll get like a real tight spot that almost seems like a baseball in one area but super tight is this my son pushing out or a contraction I feel so dumb asking lol