First ultrasound- help!!

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I had my first ultrasound yesterday!! Heart rate was 144 and doctor said everything looks good! I’m 8 weeks!!

He wants me to have another ultrasound in 4 weeks to recheck the fluid around the baby because he wants there to be a little more.

Has anyone had experience with this and things turned out okay?! this is my first baby and we tried for a long time so I’m really nervous!!