is there any one out there who has had this , i am CD 29 today and Af is due, have NOT had PMT this month which is very unusal for me so did a first response test (have some slight cramping like AF could be looming) this morning ( 3rd wee) - Have a Very faint line, i remember when i have tested with these before if it is BFN then you only get One clear line - has anyone experinced anything like this????