Male vs. Female urine for testing....

I have a pretty simple question. I was offered a job today but had to go take a urine test right away if I wanted the job. I smoke a ton, so the only clean urine I could get was from my sister. The catch is she had a baby 2 months ago and still takes prenatal vitamins as directed by her doctor. It was simple enough to get the urine into the bathroom for the test. I put it in a small container in a sock with a hand warmer wrapped around it and stuffed under my sack. It was a LabCorp facility in Illinois, and they didn't check the patient very thoroughly. They just had me empty my pockets and after that wash my hands. Made the transfer with no problem but have been thinking and worried ever since about the vitamins and any other weird things that may come up because of the recent pregnancy. Can someone please help me put my mind at ease!!!

I read over and over on different websites and basically this sums it up.

"Gender is irrelevant when analyzing for drugs. Any human sample can be used as long as the person is drug-free and not overhydrated."

Quoted from Burnt Toast

Another quote from Fake Boobs Rule

" it is a fact that by law they cannot test fluid/tissue samples for things other than drugs"