Feeling conflicted with weekly makena

So I had my son my last pregnanty at 34w5d , but I have a strong feeling I brought on the preterm labor. This is my fourth pregnancy and I’ve only had one preterm labor, however, my doctor suggested going on the makena every week till 36 weeks to prevent this from happening again. I’m now 21w and have been on makena since 14w. I’ve been reading so many negative reviews and research about this injection that is scaring me and I’m afraid of the outcome. Any mommies on makena now or have been on before and everything turned out fine with baby??

I’ve read they can cause stillbirths and preeclampsia. I’m just in shock that my doctor didn’t mention this to me. 😞