Am I overreacting?

I’m 36 weeks pregnant with our first baby. My fiancé and I have had an incredible relationship but lately I feel so detached from him. We’d always go out on dates or even just hang out at home or do something cheap and he’d always make time for us. He has 3-4 days off every week and the days that he does work he works 12 hour shifts. I don’t bother him on his days that he works because I know he’s had a long day and he wants to relax and play his video games when he gets home, that’s not a problem and I respect that. What’s been bothering me is the past 2 weeks on his days off, he’ll make all these plans with his friends and he won’t spend any time with me. Out of the past 2 weeks, he’s spent no more than 3 hours with me, I’m not even exaggerating. We’ve both expressed how important it is to the both of us to spend time with each other these last few weeks before the baby comes. When he goes out he’ll literally be gone all day or if he goes out at night, he’ll be gone all night/early morning. I know my hormones and emotions are all over the place because I’m pregnant but I’m just really sad. I want to spend time with him but he doesn’t seem to care. I asked him on Friday if we could go to the mall and just walk around and hang out because money is really tight so we’re not able to go on an actual date and he just ignored me and then about an hour or so later he went out with his friends. I know he’s not cheating or anything like that so I’m not worried about that but I just feel so alone lately. I’m not sure if it’s the fact that I could have our son at any time now and he’s starting to realize that or what but I don’t know what to do. I talked to him about how I feel yesterday and he didn’t say anything back he just listened to what I have to say. I’m just wondering if anyone has any advice on what to do?