What's the latest you've had a bfp??

Danielle
So all you lovely ttc's and pregnant ladies.. What's the latest any of you got a bfp
I'm irregular so have no idea when AF is due to show its face, last dtd 15th March... I had brown cm on Friday 18th March, cramping all this day.. I also didn't opk this month so I have no idea if this was OV day.. But from reading a few things it made me curious so I've been going off the 18th as possible ovulation... However I have never noticed this brown cm before may also add I havnt spotted either. Now it's April 8th so 3 weeks today since I had this. Tested two days ago and had these curiously possible bfps.. Lots of mixed reviews.. But they havnt convinced me fully that's there's a possibilyy I may infact be pregnant! 
What do you think to my tests? Would you be convinced from seeing these? 
I'm not sure. I'm planning on getting a clear blue soon because I have no idea if taking photos of my tests are enough to convince me I am. Although I have been feeling extremely sickyy..appetite is up and down one minute I'm starving the next I can't stand the sight or thought of food I'm having odd tugging crampy sensations around pelvic region also, cm seems to be somewhat ewcm style and has been for a few weeks now not in abundance just the norm.. My temp this AM was somewhat normal.. Although I did only start taking btt a few days ago just for the crack.. 
Fmu 7th
6th evening after hold. 
Edited