How long did it take to get a dark BFP

Aimee
Hi ladies so on Monday I tested using the strips off amazon I swear I got a vvvvfl and the same on Tuesday  tested Wednesday  on a first response in the middle of the day and got a negative so left it until Friday and tested again with one that I got from the pharmacy at about 4pm thought u saw a vvvvfl again so tested on the Saturday morning with FMU and I'm pretty sure it was negative. I'm on cycle day 45 now and don't feel like af is coming anytime soon I normally get sore boobs and very emotional but nothing as yet. I just don't know what to think anymore I feel like I'm going mad. Any advice is very welcome or if anyone going or been through this please let me know what happened. 😊