Sleeping in your side - help please!

H • First time mama to a sweet little babe due in August 2019 👶🏼

I’m almost far along enough where I should be sleeping on my side. I’ve tried it a few times and wake up in a panic because I can’t feel my arm. Can anyone suggest which pillows you use and what do I do with my arm under me so I can sleep comfortably? There are so many different pillows, I find it overwhelming. Bonus points for a picture of the pillow.

Thanks in advance!