Hallow Dear,
You are 31 weeks pregnant. At this stage of
pregnancy, the foetus does move freely in the
uterus. When you feel it is moving rather too much, I would advise you to count the foetal movements. Count the number of times foetus moves in continuous 12 hours. A healthy foetus moves about 10 times during 12 hours period; or you can say on an average it moves once every hour. Of course, the foetus also has its own body clock. It does sleep at its own time, which may not be congruent with mother's sleep. Therefore I advise to have a foetal movements count for 12 hours. Please make note of each movement on a paper to avoid mistakes in the count. If the count is less than 10 in 12 hours, you have to report to your Obstetrician.
I do empathise your concern due to previous
placental abruption. However, placental abruption is a sudden event, though the cause may be over a period. So the foetus stops moving when placenta is separated. Increased foetal movements may not be indicating placental abruption. Still for your mental peace, better get
ultrasonography done to ascertain the health and growth of the foetus and also integrity and maturity of placenta.
If baby and placenta are healthy and normal, you need not worry about the foetal movemts if they are within normal limits. Another investigation you may undergo is electronic foetal monitoring which not only will count the foetal movements but will assess the foetal cardiac activity during movements and during Braxton Hick's uterine contractions. If there is any impending risk, it will be reflected in the foetal heart tracings.
I hope this guidance is useful to you.
Dr. Nishikant