Vomiting and pelvic pressure

I just had a little episode of throwing up. I didnt really have morning sickness or alot of throwing up with this pregnancy. It wasn't violent vomiting but it was pretty harsh.

Anyway immediately afterwards my lower back and abdomen is very achy. And alot of pressure in pelvic area. Its hard to walk upright. I'm assuming its where my muscles tensed up during throwing up. Was feeling fine before that.

Anyone else experiencing something similar after throwing up? 30 weeks.