***Please please read***

Jackie • wife | mama x 3 | life luvah | 🌈 due 1•1•2020
I looked all over the Internet and can't quiet find the info im looking for. 
This morning I collected my FMU in a cup and placed it under my sink. Had to get the kids to school so I didn't test until about 2 hours later (using the collected urine from earlier) with a dollar tree test. Anyway it was negative and I'm not taking this well at all. I'm currently 15 dpo. AF should have been here yesterday, but i ovulated a few days later this cycle compared to last so I'm thinking AF is actually due tomorrow.
What I want to know is if using urine that's a few hours later affect the test in anyway? Or should I just come to grips that we just weren't successful this month?