Hi, sorry to hear you're feeling this way 
I understand how you feel, I've had times when I've felt the same. At times I've been in tears questioning whether DP still loves me as I swear I can see a difference in the way he acts towards me. It's such an awful feeling because not only are you feeling shit and shit about the way your body is changing (maybe this is just me) but then you doubt the love of the one person you really need right now!
For me it got too much last week and I sat and cried quietly while we watched the soaps. While he didn't say anything at the time, DP later asked how I was and that he was worried about me. Since then I've come to notice that I think it's mainly my wild hormones and emotions that have made me question his love for me, and in fact DP actually doesn't know what to say or do at times so doesn't say anything at all! Complete breakdown of communication + rollercoaster hormones = paranoid and insecure pregnant woman!! Since that night, I've felt much better just by him coming over to me to give me a kiss or putting the kettle on or something and making a little more effort in being affectionate.
I don't think it's unreasonable to expect a little affection while you're pregnant and really need it along with some reassurance, but also bear in mind that he's working his butt off to provide for you which shows an immense amount of love for you, I imagine he's just exhausted. My DP has been getting a little snappy at times but I think to myself 'I'm not the only one trying to cope with this pregnancy and worried about our baby arriving', men worry about it too and in addition I think they often feel excluded throughout pregnancy so you need to also give that some consideration.
In my opinion, it sounds like your partner is going to the end of the earth to provide for you and your family (this to me instantly shows an incredible amount of love for you). I do however think that he could be a little more affectionate if he isn't even giving you a kiss goodnight- this would feel hurtful to me too. Could you not set aside an evening where you have a night in to yourselves with a takeaway or something and really have a good chat about while you really appreciate everything he's doing to provide for you and your family that now and then you'd feel a lot happier if he showed a little more affection? Try explaining to him that it's hurtful to you, and reassure him of your love for him. He might open up to you and tell you about his feelings of insecurity and worries which you're not even aware of, just like he probably isn't aware of yours.
Apologies about the huge message but I really feel for you being through similar myself! I really hope all goes well for you