Af is LATE .. ugh

Last day of my last period was May 15th- I’ve taken HPT and they have been vvvfl that looks like indents, haven’t taken another test in over a week. Have a doctors appointment tomorrow and they are going to do a blood test. I’ve been moody and having stomach cramps like af is going to start and it never does. Idk what’s going on - has anyone had this happen before?