I am 20 weeks pregnant due for Anomaly scan  day after tomorrow. i had low lying placenta at 13 week scan  and was told that it has resolved  at around 16 weeks by physical examination by my gynaecologist. right now, whenever I sit on chair, or have to bend briefly, I feel a pressure at my previous Csection line, like a band.. not painful, but I have to lie down, then slowly it goes away. i cannot sit for more than 45 minutes or so.. is it a normal occurance or could it be due to unresolved low lying placenta ?