I need mothers help how to figure this out?

ok so the ultrasound tech guessed on the of my unborn baby she took a long time over 1hr and the baby had its legs closed so she got a shot from the back she said she saw 3 lines so she said i guess its a girl dont quote me on that since the baby does not have her or his legs open i cant be 100% sure then the tech said maybe your ob will send you for another ultrasound later on in the pregnancy... what should i do other then wait n check again ladter my hormones are killing me