Sleeping Positions

B • Married 💍 Pregnant and expecting my 3rd 👶

Hey ladies! Can you help me with what is the necessary time we are NOT supposed to sleep on our backs? I am 16+2 now. With my other 2 kids (but that was over 10 years ago so I could be wrong lol) I thought I didn’t have to worry about sleeping on my back until the 3rd trimester. However, I am hearing 2nd as well?!?! I’ve had multiple back surgeries due to an assault years ago and enjoy sleeping on my back, but now I am sleeping even less because I’m constantly uncomfortable on my sides and paranoid when I wake up on my back. Any info would be appreciated ❤️ thanks!!