Help!! Advice!! Quick!!!

Jessica • 9y.o daughter. 5y.o son. Trying for #3🌈baby

Alright guys. Been trying for 7 months. One chemical and 1 MC (I have a 9 and nearly 6 year old). My dr went and gave me the clomid/progesterone/estrogen combo (both of my babies were born early). I don’t start taking it til next cycle if I don’t get pregnant this cycle.. I’m just so afraid to take it!!! I’ve heard horrible things about clomid thinning your uterus and it hasn’t been a year yet. Should I hold off? What would you do? Help!! Advice!!!