Hi there, I have understood your concern and I will suggest you the best possible treatment options.
First of all do not panic.
It is quite common to feel laxity of vaginal walls after
vaginal delivery.In my opinion the tissue that you are feeling near the vaginal opening can be protrusion of lower portion of the vaginal wall. May be the area near
urethra. As you can feel it only after efforts, it must be very minimal laxity issue.
Secondly, if normal uterine supports have become lax, then you can feel the
cervix near the vaginal opening.
It can felt as a firm knob like rounded structure.
And yes if the
rectum is full, then you can feel the bulge on the lower wall if vagina.
I will suggest you to get a gynecology check up done and confirm about the laxity and prolapse of vaginal walls and uterus if any.
Please opt for a healthy diet and regular exercise regimen.
Regular intake of iron, calcium and
protein supplements is advisable.
Please learn and practice Kegels exercise regularly.
I hope this answer helps you.
Thanks.
D. Purushottam Neurgaonkar