An ultrasound might help to visualize the area but even so there is littlte that you can do or would do at this point in time so there are few reasons to obtain one.
It is possible that you pulled a stitch. However, there are other stitches which should retain the result. Rarely does a whole operation depend on a single stitch. I would rely on your surgeon's evaluation who is in the best position to judge your outcome.
It is also possible that sensation is returning and that you are becoming increasingly aware of pain in your abdomen. As you are undoubtedly are aware, you have little if any sensation in your lower abdomen and a slow creeping return of sensation from the outside-in.
You may want to ask your surgeon if you can now take NSAIDs to manage the pain and inflammation.
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