Aw, I understand your worry, mama! Honestly, I haven't personally dealt with subserous myoma during pregnancy, but a few of us from my mum group have had fibroids and most were okay naman throughout, it really depends on the size and position kaya it's best to talk to your OB about yours specifically so you know what to expect and what precautions to take. Maraming cases na fine lang and deliver normally, pero your doctor needs to monitor you closely lang para sure. Sending you hugs, this is definitely something to discuss in detail with your doctor so you can have peace of mind!