I just dont get whats wrong?

So.... me and my husband have been married for 13 years. I am currently 20 weeks pregnant. We have a 9,4 and 1 year old. My husband never wants to do it on weekdays.... fine... however on weekends, he always wants me to do him in the middle of the day... dude wtf. Its 3 pm. I am in the middle of cleaning. There are 3 kids running crazy around the house. I smell like Pine sol. Im halfway through a migraine that my pills are doing nothing to help. I'm not in the mood. He calls me in the bedroom and he's just flopped on the bed with his stuff hanging out. When I tell him I can't he starts begging for a handjob and pouting until I do just to get him to stop so I can get back before the kids break something. And its not like I dont want to, but I just cant seem to get him to understand he only has to wait a few hours for me to get the kids settled down in bed, clean myself up and actually mentally feeling like I want to and then we are in the clear. I want to every night. After the kids are asleep and I no longer smell like a foot. I mean, he can't wait just a few hours? I haven't done it in months because he can't wait and can't seem to understand I cant just leave kids running around, and I personally refuse to do so, because a two minute quickie that leaves me with nothing out of it isn't what I want for my once a week go. He gets his and I'm left with nothing, as always... Then the next weekend, it starts again... he refuses to do anything at night after the kids are in bed either... I've tried. He literally goes as far as keeping our 1 year in old in bed with us at night so I won't try...

P.S my current pregnancy was caused by one of the few times I did do it in the middle of the day, which turned into a 3 minute nothing for me with a one year old banging a toy on my bedroom door and listening to my two older kids screaming at each other from the living room ... I haven't gotten a real "session" in over a year, atleast. Unfortunately bc pills really are not 100%... and surprise!

I just feel like he doesn't care that he picks the worst parts of my day to ask for something that he will blow right through without any thought or care on my part...

I just dont get why he even bothers at all...