I had this.
I had absolutely no bleeding through the whole of my pregnancy, I was really surprised when they told me it was covering the cervix at an earlier scan, as I had had nothing to show. A woman I had worked with had had lots of bleeding because of it.
I was told at my scan a month before I was due I was still 0.4mm too close and I asked for a scan in another 2 weeks to see if it had moved enough.
I made an absolute case for myself, no diabetes, textbook BP, birthed a 9lb 2oz vaginally before and this baby was measuring much smaller. And they agreed to another scan.
And then 3 weeks before due date my body had another idea. Bleeding, water broke and rushed in via ambulance. They stabilised me and I wasn't having any contractions at all.
Even then, they offered me the chance to not have a cesarean if I really didn't want it.
But in reality it is the safer choice. I lost a lot of blood the previous birth. They left me until first thing the next day to get a fresh team and chance to get correct blood matches, as with this, you are far more likely to have bleeding.
And honestly it wasn't as bad as I thought. I got to hold my baby immediately, I could breastfeed within that first hour. It was the right decision to what could have been life threatening to us both.