TMI question but idk who else to ask

Anon for a reason because I'd never just ask this to anyone and please believe me I'm sorry for asking but I just need to know some answer

I'm around 6 months pregnant and every time I masturbate, my heart beats extremely fast and it feels like I have to breathe really deep after for like 2 mins like all of my breath is gone. It was never like this before so idk if I'm affecting the baby and if I should stop or if its normal... like I honestly feel like I've been suffocated?