Is anal safe?

A little back story: I am 19 weeks pregnant with my third baby. At 16 weeks my Dr told us to stop having sex because my placenta was 2 cm away from my cervix. She said that could change as my uterus grows but for now no sex and it's been three weeks.

We have been trying to get by with playing with each other but I have been scared to even get off. I don't want to hurt the baby.

Last week we tried anal sex and it felt very good once he got in there. I am wondering if it's safe for us to try this again or could it be dangerous based on where my placenta is? Can I still get off? Has anyone gone through this?