Don't worry, i was like that before.
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In 20 weeks, the B超 doctor saw a cyst- they couldn't categorize wether it is solid or liquid at that time. My gyn- she is super good, told me that things are fine, no worry was needed. But for giving me peach of mind, she still ordered B超 for me pretty much every month. Once I got to 34 months, the cyst was gone.
My boy is almost 26 months old now, active, handsome, smart...(you know, all in mom's eyes)...
So take it easy and take care!