Confused Cycle

I have a regular cycle, well sometimes my period gets delayed like a day or two. This month, I was 11 days late which has never happened before, so thinking I was pregnant, I took a PT on the 8th day then 11th day (both turned out to be negative) Anyways on the 12th day I started having spotting (pinkish brown) not a lot maybe just a dot. Two days after that I had a little more blood but then it went away. I thought my period came so I put a pad then went to bed. The next day I went to the washroom to check but there was no blood just a little brown spotting. I have no period/pregnacy ish symptoms except cramping but now I’m confused and I don’t know what’s going on. Has this ever happened to any of you? My doctor’s appt is not until next week so I am hoping maybe I can get some answer now to lessen my anxiety. Thanks Ladies