Uterine Thinning Near C-Section Scarring: Risks & Concerns

Question
I am pregnant with my 4th baby after 3 c-sections.  After the third, I was told I had a thinning lower segment and I had not healed well.  
I'm now 22 weeks and high risk for issues not related to the previous c-sections.  Yesterday, my dr found a "thinning defect" on my uterus near my c-section scarring.  To me, it looked like a pocket sticking out where it would usually be a rounded edge of the uterus and it made for a strange shape on the ultrasound. My fluid levels are also high.  The dr is concerned because I'm only 22 weeks and there is already an area of visible concern.
I have an appointment for further ultrasounds in a week.

What can I expect in this situation, being that it is so early?   Complications in past pregnancies have been PPROM @ 22 weeks w/delivery @28 (unknown cause), cholestasis, irritable uterus and preterm contractions, polyhydramnios (unknown cause).  I am taking p17 injections, magnesium oxide and have been on modified bedrest.  My second and third pregnancies carried to 37w.
My dr mentioned complete bedrest.  Is hospitalization warranted in a case like this?   I'm terrified of a uterine rupture.  Would medication to reduce fluid levels and reduce pressure on the uterus be helpful?   What are my chances of carrying to at least 36 weeks?

Thank you for any help you can provide!!

Answer
Jenna

Although this is a complicated situation, the outcome can never be predicted.

The best thing to do is to have your antenatal care in a hospital close to your home with facilities for Neonatal intensive care units with well trained senior Obstetricians as the delivery will definitely be before 37 weeks.

You will also need to have more frequent antenatal visits to your doctor and more frequent ultrasound examination to follow the progress of the defect.

Good Luck