So my periods are normally 5 days long although last month it was 7 I went to the drs and they said possible chemical, my period pains are always bad and in my abdo area where as in last month it was all in my back it was horrendous, I’m currently booked in for bloods next Tuesday because I would’ve been on the 5th day of my period for fertility tests and hormone checks.... however I’m 3 days late, had a faint line on ASDA £3.50 test but completely negative first responses, so if I had a chemical last month could it mess up my syncing for my af?