Period late?

Okay. This might be long, and might be crazy question to some, but oh well. Anyways, last month my period was 5 days late over a UTI and all the strong antibiotics I was put on. I was suppose to start last month on the 28th, but I didn’t start until the 3rd over all of that delaying it. So if my period wasn’t late I would have started on the 29th of the end of this month, but since I logged my period started on the 3rd of September, I was suppose to start my period, but I didn’t. So far, I’m just two days late. I am never late besides that ONE time for the UTI. Well my boobs are pretty sore on the side, but I went ahead and just bought a test and it said negative. I had a appointment for my OBGYN for a check up, but I winded up having to cancel, because a death in the family, so now I won’t be able to go until I reschedule. So..am I testing too early? Or possibility my period just might be late again?