Test Says Not Pregnant But Still Anxious

I've got the implant and after three months of havin it in and not having a period, my period kickstarted a few hours after sex. I had unprotected sex about 9 or 10 times, and after a while started to think I was preggers. I've been bleeding for a week and I thought it was implantation bleeding so I bought a test just now and it says I'm not pregnant. I also don't have any pregger symptoms, but few women in my family have. I unfortunately have been drinking a lot of water and vinegar for the past week trying to get rid of a UTI, so I'm scaredmy urine is diluted or too acidic and the hormone didn't show. I don't think I'm pregnant, anymore, and it's probably just the side effects of the implant, but I'm still worried that maybe I took it too early or my pee is messed up or something. I dunno.