What do y’all think?

So my husband and I have always been very active in the bedroom. Lately he’s been busy with a full time job and being an on call firefighter as well. We have the best 8 month old possible (naps on a schedule, sleeps through the night, always happy) and I’m 10 weeks pregnant. Lately he isn’t wanting to get down and dirty because he says he too tired... and when we have done it, he cums right away and I get nothing😖 He also barely cuddles me at night now. This is all totally out of character. The only time he’s been distant sexually is when he was talking to someone else back when we were dating. He hasn’t cheated or anything since then (3-4 years ago). Am I overreacting, or is something going on??