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It is very common to find small fibroids in most women by the age of 30.
They tend to grow during pregnancy
due to the hormonal
changes and might cause issues if they grow big enough.
But regular monitoring by your Obstetrician will ensure that the fibroid is not causing any issues.
So all I would suggest is relax as of now and go for regular antenatal checkups with your Obstetrician.
Hope this helps. Take care of yourself and the baby.