Sabar ya, fibroid 3cm semasa hamil memang benda yang common, tak perlu terlalu risau. Most mums I know yang ada fibroids masa pregnant, doktor cakap boleh terus monitor saja, sometimes they grow a bit, sometimes they shrink, it depends on hormones during pregnancy, tapi biasanya tak jadi masalah untuk baby. Ada satu mum dalam my group cakap hers actually got smaller towards the end, tapi ada jugak yang experienced some discomfort, so setiap orang beda-beda.
Regarding ways to shrink it, dari what I've heard, during pregnancy tak boleh ambil medication, so mostly it's about resting well, managing stress, and keeping your appointments regular dengan doctor untuk monitor. The good news is 3cm is still quite manageable compared to bigger ones.
Definitely worth discussing dengan your OB-GYN more in detail though, they can give you the specific plan for your situation and what to watch out for. Wishing you a smooth pregnancy!