Try using lube for anal! It makes it so much better! Im 16 and my boyfriend also wants to have sex everyday and I also feel bad telling him no lol. But lube will work just fine (: and regular sex is good for the baby and the daddy to be, as long as you have a normal healthy pregnancy(:
Lol I'm 23 as well and dealing with the same situation. We're have our second daughter. Its a lil tmi(to much information) sorry but it works for us meanly me Lol because it does heart after a while. Get some toys for you & him.and just please him with it so neither of you two would feel guilty of it & plus its way better than using your plain hand.
We do anal all the time. Use lots of lube if you have to.
I love anal. Something new and exciting and honestly it is very intimate for you and your partner if you do it correctly. Make sure you and your partner have good communication, it's not going to work if he doesn't listen to you and you don't listen to the signals of your body. If it hurts you're not doing it correctly. Foreplay is essential to the process, make sure you pay attention to your body! If you are wet vaginally it helps immensely and if you are aroused your body and anus will relax a lot. You have to go slow until your body adjusts to something being in there instead of going out. Use a lot of lube in combination with your own vaginal wetness. Since infections can happen but are very rare, use a condom. Infections occur when the skin inside the anus is ripped and your fecal matter enters the bloodstream around the cut. Cuts only occur when you are going to fast. Like I said don't push your body. Don't force it. If you don't like it and your body won't relax, don't do it. This is what I learned over my experiences and a lot of research and I'm happy I did because now I enjoy it and it has brought me and my fiancé close together . Hope any of this helps if you do decide to try again and sorry for the tmi :)