I've gone through 2 pregnancies with fibroids.
Mine are pedunculated though, so on the side.
My experiences couldn't have been more different for the 2 pregnancies.
First pregnancy I had a small baby who was in breech position to the side of the fibroids. Everything was fine until I ended up in hospital in absolute agony. The fibroids were enormous and as the baby grew, it was cutting off the blood supply to the fibroids. I discharged myself after a week as I was getting worse and knew I'd be better cared for at home.
A few weeks later I had a horrendous birth as the consultant and doctors didn't believe fibroids could cause pain so I was denied pain relief and they didn't believe I was in labour. I was in labour for 4 days and my baby (and me) almost died due to their incompetence.
I was supposed to have the fibroids removed but then Covid hit.
Second (unplanned!) baby was much bigger and was transverse. I expected issues with the fibroids but had no pain at all. I needed a CS at 38wks due to the baby's position and they were worried there'd be huge amounts of bleeding due to the fibroids. I could hear the doctors talking on the ward about trying to persuade me to go home and come back another day so I would be someone else's problem.
I refused to change my CS date (it was supposed to be asap due to risk of cord prolapse) and all went as planned. No extra bleeding and no issues with the fibroids whatsoever.
OP I don't want to worry you with the first story but it was due to lack of hospital knowledge/care so hopefully you wouldn't be in that situation.
Be aware of any changes and any new pain. Mine came from nowhere and was excruciating but it didn't happen until the last month of pregnancy.
I have no idea why there was no issue the second time round as they still grew large but not to the extent of the first pregnancy.