Paranoid about sleep positions 😫

I have always been a back sleeper, so pregnancy has really been rough on my sleep. I’m 32 weeks now, and I always fall asleep on either my left or right side (usually left) but every once in a while I’ll wake up on my back 😨 I flip back to my side immediately, but I don’t know how long I lay on my back while I sleep! Am I being over-cautious?