It happened when inserting the endometrin supps. I did find that I could kind-of maneuver around it, but it freaked me out b/c I was afraid my cervical length had diminished. I went in to my OB's office and got an u/s and all was fine. It then went back to being easy to put it all the way in there. My only explanation is that maybe with the growing uterus, something was temporarily pushed out of place, or I have an anteverted uterus (tipped forward) so I don't know if that was related... In any case, all turned out fine! If you're concerned, why not give your midwife a quick call? I've definitely used that option multiple times over the past couple months to make me feel better
. Good luck, but I'll bet you're fine!