Hi there, Amanda. Congrats on your pregnancy (I have been MIA). With each of my pregnancies, I HAVE to take progesterone or I will miscarry (have had 5). For some reason once I become pregnant, my body stops producing it.
When I was pregnant with Gavin and Darian (who are 10 and 9), I had to get injections in my butt twice a week til part-way through my 2nd tri. I dont remember the specifics, but I didnt need to past a certain point. With Raegan (who is 20 months), I did the suppositories instead, and for the first 15 weeks. I am pregnant again and just got my prescription for the suppositories again.
I am not sure what or why your Dr would suggest it NOW, and not before, but I dont have that info. If you have any questions, feel free to ask!