Anal??

Me and my fiancé lost our virginity’s together in October 2020, I’m 4 months pregnant now (yay!) And he’s asking if we should consider anal to try it out and try something new. I don’t know the precautions to take so that 💩 doesn’t get on him LOL. Is anal even safe to do when pregnant? And what lube should I use if any? I’m beyond scared to accidentally get dihareea or something on him😭😭😂