Confused

This is weird but then again I need answers.... Ok my period was supposed to come on, on the 11th and didn’t! Prior to that I started having mild spotting which happened on the 7th 11th and 13th. It wasn’t period blood it was more like brown old blood so I thought it was implantation bleeding. The morning of the 14th it became blood like my period and I’m cramping like period.... so my husband suggested I take a test AGAIN. this week (meaning I already did 3xs between the 7th to the 10th) and all was negative! So the test I just took has a very VVFL👀🤷🏻‍♀️ with color. What’s going on??? And I have PCOS so my periods fluctuate a lot.