Jealous Husband.. 😐😐

The strangest thing has happened to my husband during this pregnancy. We have a great relationship normally; we've always had a great deal of trust in our marriage and dating life, honesty and good communication. This is our 2nd baby and we have a 3 year old son as well. Well, ever since I got pregnant (this baby was planned and tried hard for) my husband seems to be getting jealous very easily over things. In the beginning I was sick often, I'm 16 weeks now, but he would want to be intimate everyday and I couldn't do it. I was nauseated and exhausted and we had sex maybe 1 to 2 times a week. I remember now, looking back how upset he got. Not at me directly, but how jealous he sounded describing how much he needed me and wanted me now and how I was not as close to him as before. For the past month now, this jealousy has escalated into asking me if I am talking to any men, messaging any old flames from the past, do I love him as much as before, do I still find him attractive, who am I talking to when I pick up my phone and text, ect.? Today we actually got into an argument because I was telling him a story about when I first moved to our city, before we met, and he just went off the deep end because the story had a man in it that I dated 10 years ago! It was the most ridiculous argument in the world, I swear. I actually was so fed up today I asked him directly if HE was doing anything wrong and had a guilty conscious, because I just couldn't understand his behavior and accusatory tone. He said of course not. I just don't understand it and it's starting to make me feel sad. I felt like this pregnancy was going well and we were doing good, from my perspective anyway, and now I feel like he harbors these dark thoughts about what I'm doing and feeling towards him. It's confusing & hurts my feelings.

Has anyone ever experienced this? Your partner changing during the pregnancy or acting jealous and down? My first pregnancy with my son was nothing like this. He was connected and present with me like he always has been.

So confused.. 😕😔