Wedding Reception While Pregnant

I got married in December. My husband and I had been engaged for 18 months, my parents have both passed so any wedding we had was out of our pocket, and we just really didn't want to do the whole thing. We ended up planning a small (25ish guests) wedding in a few weeks before Christmas and dinner at a local restaurant. It was everything that was important to us. We had a photographer, a beautiful venue, and Christmas decorations on all the streets.

Flash forward a few months and I am 14 weeks pregnant. My in laws now have offered to throw us a wedding reception. I get the desire and really appreciate it, I know they were disappointed our wedding was small and they couldn't have their own guests. But I'm absolutely not comfortable with the idea. I wouldn't fit back into my dress, can't do all the primping to feel confident, can't drink, and don't feel comfortable inviting the same guests who've already bought gifts out of fear that they'd feel obligated again.

My husband called and told his mother no, and now he's angry at me for not agreeing to it or having an idea for a compromise. Any suggestions? I'm not trying to be difficult and I really appreciate the thoughtfulness, but now that I'm pregnant my head is in a totally different spot.