Girls, hi ?? Can you tell me what week it is now that I can find out t…

Girls, hi ?? Can you tell me what week it is now that I can find out the sex? And how did you find out? I plan to go for a paid ultrasound in addition to my prenatal checkups, based on the fact that a scheduled ultrasound is planned at 20 weeks, I could probably book one now and find out the sex? (17-18 weeks)