Periods after failed FET

Hello! Has anyone had problems with period length after a failed FET? My transfer was in April and my period came 10 days late after I stopped the meds. It lasted about 9 days. Now I am again 10 days late, I have some cramping but almost no flow, just when I wipe, sorry tmi. I have no idea what cycle day I am. I was supposed to let the clinic know my day 1 of cycle in order to get ready for another FET but with my cycle being so messed up I wonder if I should wait longer maybe before trying again?