Hello I am 18 weeks pregnant with first baby .. conceived via ivf due to low amh...I conceived after 8 years...I don't have any previous miscarriage but I had 2 episodes of spotting at 5 weeks and 10 weeks...after that nothing...my cervix length is 3.5cm...doctor prescribed me proluton 250mg injection from 19 weeks to 36 weeks to avoid preterm labour...I searched in the net it says lots of side effects to baby..is it necessary for me??