Has anyone mixed COVID vaccines while pregnant?

In April this year, I got the J&J vaccine while I was away at college (pre pregnancy). The day after was hell, I had to send out emails to all my professors to explain that I literally couldn’t get out of bed because of how bad I felt. Body aches like if I had just gotten run over. Now I’m 17 week +5 pregnant and I just got a green flag for a booster shot. I was told by my OB that I could pick either Pfizer or Moderna, but I’m just wondering if anyone has mixed before and how their experience was. I know I want to get vaccinated because I’ve seen so many pregnant women die due to COVID complications and during birth too. If I get the booster it will most likely be Moderna but man I’m like scared about it yet again I did get J&J which I mean was shit.