Early gender prediction??

Sa

When can you find out the gender? I feel like some of you are finding out so early! I know there is a test you can pay extra for, but i don’t know if i want to spend my money on it right now with all of the other expenses. My sister in law says it’s 20 weeks when you find out. Is that the soonest i could find out without an extra blood test? And how much did it cost you to find out earlier if you did do the blood test or something else?

I had no idea there were so many options that are affordable! Thank you guys so much!!