Sneak Peek Gender test

I took the at home test 2 weeks ago and got my test results back saying it’s a boy. I live with just my boyfriend and completely scrubbed my bathroom before hand. I even washed my hands for 5 minutes and scrubbed under my nails. Also took the test in just my bra. I followed the directions completely but part of me is skeptical because I grazed my bath towel so lightly 😩 We had an ultra sound last Friday and of course the baby wouldn’t let us see. We have a 3D ultrasound on the 5th I’ll be almost 19 weeks. Just want to know anyone else’s experience.