Hi everyone, I've had a threatened miscarriage since 3 weeks. At 18 we…

Hi everyone, I've had a threatened miscarriage since 3 weeks. At 18 weeks an ultrasound also showed a threat. Since week 3 I've been using Utrogestan suppositories twice a day. I'm still using them; the doctor says it's okay until 36 weeks, but I've heard that Utrogestan 'closes' the uterus and that labor will be difficult because of that. Is that true? Has anyone used it like this?