I would recommended seeing your primary care doctor
. This requires evaluation. While this may be a minor or self-correcting problem -- this could also be a sign of a more serious disorder. If required, your primary care doctor may refer you to a Gynecologist.
Firstly, there are many organs in that area that can cause those symptoms. The first problem that comes to mind is what we call pelvic organ prolapse. In many women, especially those who have many vaginal deliveries of their children -- there is weakening of the muscles on the pelvic floor (the lower abdomen). Ultimately these woman cannot keep the pelvic organs (the bladder, uterus and rectum) in their normal place and so they press down causing a sensation of pressure. Often the uterus is the main prolapsed organ, and occasionally even can come out of the vagina. This can be treated by a gynecologist with many options available depending on the type and severity.
There are many other problems that could be causing your symptoms. Infection of the abdomen or urinary tract can cause this. Muscle strain
is an also possible cause, but I believe less likely. Nerve pain can cause this but again less likely.
I would recommend you see your primary care doctor. This sounds like pelvic organ prolapse which requires evaluation and treatment.