I feel lost

So I kno how this is going to sound but I promise it isn't what u guys think. My bf and I have been together for 10 years, we bought a house together last year and I'm 15 weeks pregnant with our first baby together. Everything was fine up until a few weeks ago. He just doesn't spend time with me, doesn't ask about the baby, we don't have sex as much as we used to. He has a friend and everytime she calls I feel like he does running, I know you all are thinking he's cheating on me but trust me I know that's not it. They both smoke weed and I obviously can't, I did before I got pregnant. I said something to him last night and I thought that since we were both off today that we would spend some time together but he wasn't home all day. Right now he's working his second job till 8. I know I've been alittle crazy lately and I'm definitely not myself but I can't help it, it's all the hormones. I miss him and feel unwanted. I just don't know what to do. I'm not leaving him that's for sure but I just don't know what changed, is it the baby? We planned this baby. Idk. I love him and I kno he loves me but I don't feel like he does right now.