Hi MA
Oh hun, you are understandably going crazy with worry, and who can blame you? I've been there, and it's a nightmare!!
Firstly, just to reassure you, an abdominal scan can check for fluid levels, but can't really see your cervix clearly. It will show Amelia's position in the womb, and would easily pick up if she had passed down into your cervix, she would be very low down in your pelvis and it would be obvious. It will be impossible to tell without a TVU the length of your cervix, or if you have dilated to the stitch, tho it is possible they could see if your membranes had bulged into your cervix.
However, if your worst fears had been realised, and the membranes had bulged, and you were leaking amniotic fluid, I am certain you would be having symptoms to alert you to the fact hun. THere would be lots of pressure, and the fluid would run, like a trickling tap (sorry, fawcet). It is possible for you to have funneled to the stitch by now (as I did with the twins), BUT that is ok, the stitch will not allow it to open further. If it did (and that happens only in rare cases), you would feel tearing, and there would be bleeding.
I have had a failed stitch, and hun there was no mistaking it

You have had a nicely closed length of cervix, it is unlikely that there have been significant changes in the past 5wks. However, I'm with you that you should have had more checks, even if only for your peace of mind. I would be reluctant to have too many internal exams via speculum, BUT can you ask for another TVU? It is always worth checking an IC up to atleast 25wks, beyond which point it is no longer a direct threat.
I do know that routinely many doctors stop scanning a stitched cervix after 20wks because they have "done all that can be done" - supposedly. I don't agree with this rationale, and feel it is important to check the status of a weak cervix stitch or not. My gut feeling is that your cervix is doing fine hun (for what it's worth), BUT I can see no harm in pushing for them to check it again.
I don't think you have a leaking amnion, nor do I think your cervix has changed in recent weeks, but I totally understand your need for reassurance. I hope that's answered your question MA? Get back to me if not

x