Fiance is guilt tripping me for sex

So I had our son 28 days ago. My fiance has been all over me since the 3rd day I got out of the hospital. Hes either begging for sex or demanding a blow job.

He asked for a blowjob for xmas. I told him multiple times, I didnt feel like it. I'm tired. I take care of the kids a day just give me time.

Now hes pretty much mad at me cause I wont give in saying "I used to give you oral" and "that's all I asked for for xmas and you couldn't even do that"

I told him I was gonna screen shot our messages and ask people of he was in the right.

So.. am I selfish or is he being selfish?