Is is safe to have threesome with two males during 3rd trimester maternity

I am presently 7 months expecting by a semen donor that is additionally my monogamous FWB. Day or two ago my better half stated his dream is having rectal intercourse me vaginally with me while my FWB penetrates. We chatted about any of it with my FWB in which he stated that is also their dream. I experienced tried DP (dear partner) with my hubby and adult sex toys before, but never ever with two…