Pregnant and getting a lot of pressure from in laws to get together.. saying no until baby is born. Selfish?

I’m 20 weeks pregnant and already huge and going to bed early every night because I’m so exhausted. I have high blood pressure already and headaches..I’m at a bit of a loss because I have my husbands family who is wanting to plan family gatherings especially in a month fir Easter. I was completely honest and said I’m hanging on for the weekends for dear life that I probably won’t be attending any family events until after the baby is born. My sister in law responded with are you really going to be a hermit the rest of your pregnancy and I said yes it just takes a lot out of me and because of my work schedule I truly cherish anytime I have to rest (vs spending a 4 hour outing with them, I mean common really?).. am I being selfish I mean isn’t it understandable? Obviously I know Covid is getting better so it’s not the main reason but also in the back of my mind. I just would rather not go anywhere or see anyone until the pregnancy is over with. My husband completely understands and said it’s understandable. He supports me so much. Anyone have any advice? Is it selfish on my part?