Preventative cerclage


When was your preventive TVC (McDonald’s) preformed? I have one scheduled for week 14 but the doctor was wanting to do the wait and see approach. He said he usually does them between week 16 and week 20.. I had my son at week 18 and was worried about waiting so late to get it done. He basically told me there’s little research suggesting that cerclage actually helps or is any more effective than progesterone suppositories. He is more than willing to preform the procedure but it had me thinking if I was being drastic on requesting my TVC so early on... I just read that success rates are better in preventative rather than emergent.. any advice? Am I rushing it? Should I wait to have some shorting of the cervix, I get checked every 2 weeks...or am I right about getting it done early?