Hi. 4d scan perfectly safe then hun. I can understand your temptation to get your cervix checked at the same time, but bear in mind that it's not gonna be accurate sweet.
If they did see some mild funneling (not a problem now the stitch is in), they cannot tell how long or short your cervix is, and it may just set you off worrying. What was your CL at the last scan? So pleased they put the stitch in. Was your cervix still closed when it went in? They probably did a macdonald stitch - a thick mercilene tape is used, it looks like old typewriter ribbon x