I think it's pretty normal to feel this way. During my third trismester onwards, I had absolutely zero interest in having sex although I had other mummy friends who were pretty active still. I just felt heavy and tired all the time.
After baby was borned, I felt even more tired out and because I was also struggling with breastfeeding, the thought of engaging in any sexual activities never even cross my mind.
I guess what you are feeling is pretty normal, and like Jamie suggested, it's important to talk to your husband about it in case he feels left out or excluded by the new baby.
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