I’m worried

So I found out I was pregnant on Christmas after having a miscarriage at 17 weeks but this pregnancy has been tough. Come to find out I have a weakened cervix which lead to the miscarriage. But why I’m worried because 3 weeks ago I had a cervix check n my cervix before I was 3.4 3 weeks ago I was 2.2 I got admitted to the hospital the same day . The following day they checked my cervix and it went to .8 😔 I couldn’t get a cerclage anymore I had to get a pessary which by the way isn’t fun always feel like I don’t empty my bladder. I’ve been home for the past 2 weeks I have to have a routine progesterone shot every week and on Tuesday 5-1-18 I get a ultrasound to see my cervix. if it got any lower I will get admitted to the hospital. I will be 23 weeks on Tuesday and baby girl can not come that early that is not the viable stage . If everything is good and my cervix didn’t move I get to continue on being home . I guess why I’m so worried and nervous because I really want her I don’t want to lose her and not knowing is killing me 😔