I got the bfp 6 days before AF due, with first response, it was a very faint line which became stronger each day. I remember I wanted it so badly, we were trying for 4 months and each month I'd be checking online all day for "very early symptoms of pregnancy" because I have no patience!!! But I'm afraid to say there aren't any because like so done else said, if the hcg is strong enough to give you symptoms then you will have a bfp. Except for the symptoms of pms, you literally feel like AF is coming. Xx