I had Grade 4 (posteria) placenta previa with Dd2, had a bleed ar 27 weeks, and another big one at 32 which led to me being hospitalised (steroids given) until they could try and get us to 37 week Csection-
It was incredibly lucky they did (even though 4 + weeks staying on an antenatal ward was a nightmare, Dd1 was also only 15months at the time and had never been away from her at all, I must've cried the entire time missing her, but visited often, and was in there for the right reasons).
The 'lucky they did' was whilst in bed at 36 weeks Dd2 switched from head down to breach, putting a pressure on full cover placenta that started a huge bleed so EMCS- we had to wait a while as they needed extra consultants plus a self salvage transfusion as they were expecting excessive blood loss, which did happen, 2.5 litres apparently. 2 hours in theatre but she was out okay.
Lots else that I wont go in to, they didnt scan so weren't aware of the breach, I asked them to check, was convinced she had turned, I felt her! But short stay in NICU for Dd2, a bit longer to wait for her to put on weight and home.
Now she's just turned one, in the 95th percentile and happily playing with Dd2 on their Christmas bounty!
I've had some problems as they had to lengthen my section site quickly, nerve damage and abdominal adhesions, but on the mend!
I suppose the only advice I'd give is get checked and voice every concern loudly, I wish I'd spoken up a bit more.