HELP meeeeeeeee

Okay. This is a very odd question.

My sister made me take a test today. Note she is pregnant and handed me a cup that she peed before but it was dry and clean. I just couldn’t find a cup. And when I took the test it was dark positive. Could it have been from hers??? I’ve taken tests before today and they’ve never been that positive . I had held my pee for awhile so it’s a possibility I am pregnant but I’m questioning solely on the fact she peed in it first. Here are the tests in order as follows

First pic

First test - held pee used sisters dry cup!

Second - same Pee

Third - squeezed pee out in different cup!

Second pic

First test - same test held pee sisters cup

Second test - same from upper pic squeezed pee faint line!!!

Could it be positive and just deleted pee??