Overweight and false BFN?

Tiffany 🌻
Okay so I'm officially 9 days late, on CD 45, and 15 DPO. And that's DPO according to glow. I'm not 100% sure that's when exactly ovulated. And of course another BFN with FMU. I had spotting and cramping exactly a week before AF was due which I assumed was IM, I've had sore nipples, on and off nausea/hot flashes, on and off cramps. I can't schedule a drs appointment because my new insurance won't kick in for another month. Honestly, that may be a blessing in disguise so I'm not rushing and have to wait a little longer. 
So my question is... I've read a few articles and post lately about it taking longer for overweight women to get their BFPs. What's your opinion or experience with that? 
And before you start saying get off your butt and lose weight because overweight isn't healthy for the baby blah blah blah. This is also the first cycle I have been exercising and extremely active. And dieting. I haven't eaten a damn burger or any other red meat in 2 months. Also no potatoes. And if you know southern women we like our red meat and potatoes. Especially since it's deer season!!! Just hoping maybe the exercise and eating healthy jump helped!!!