Is it me or something else?

I've been married to my husband almost 3 years now And we have 2 wonderful children together; ones 3 and the newest is 9 months 😍

Since the birth, maybe even before, of our youngest I haven't had one ounce of sexual thoughts or needs for my husband. Mind you, we still have sex, not fun or any intimacy, just kind of let's get it over with sex.

It gets my thoughts racing and I feel this is all my fault and I'm the horrible person that just isn't attracted to her husband sexually anymore. I love him, tons, and love everything he does for us and how he is with our children but I don't care for any intimacy at all, unless it's a back rub lol.

I am a stay at home mom who basically does everything because he is gone to work very early and can come home very late at times (nothing I'm worried about ) and I take care of a 3 year old autistic child and a 9 month old day and night while keeping the house somewhat kept. I am exhausted most of the time and maybe a little resentful he gets to leave this house all alone, a lot.

I've tried, I really have, but I just can't make myself get excited or anything.

Is this me not being attracted to him or is this maybe some hormonal imbalance from having a baby and still breastfeeding?

Should I be looking into a doctor for this?