Help please!

My bf and I have been together almost 7 years. We have lived together for the majority of that time. We have 2 kids. A 12 year old and a newborn. We used to have sex ALL THE TIME. In the kitchen while cooking dinner, on his desk in his office.. and so on. I get that over time and as we get older things will slow down. So then we were having sex a couple of a times a month. Not a big deal it’s still satisfying enough. Well when I found out I was pregnant the beginning of this year I was superrrrrr sick. Throwing up every day so sex was non existent obviously. Once I started to feel better we tried and was unsuccessful, understandably so some people just can’t get past the whole pregnancy thing. I’m not 13 weeks PP and I’m DYING. I’ll admit I’m usually very submissive, I prefer it that way. I’ve made comments and have tried initiating and NOTHING and idk what to do. Im seriously losing my mind over this. Please all advice welcome on how to start having sex again with a newborn and how to approach this with my boyfriend. Thanks