No BFP but 2 or 3 days late

Hey lovelies going outta my mind a bit here... Am relatively new to all this and only been trying for 4 months since I came off my pill. I am 15 days dpo on cycle day 34 and currently 2 or 3 days late. Glow predicted period on weds but 2 of my previous 3 cycles have been 32 days, the last was 30. All of the tests I have taken so far have been BBBFN. What os the normal time to get a BFP of i am pregnant? Also any advice on tests that work and when next to take one? Thank you and baby dust to all xxx