Breakthrough bleeding, can it cause a BFN?

Dr
If you can relate to this or know someone who has had this please help. 
I was curious to know if break through bleeding (Not implantation bleeding) can cause a negative pregnancy test?
I've had two chemical pregnancies in a row which also means I've gotten pregnant twice in a row. Maybe I'm just being stupidly hopeful but I just find it a little suspicious. I plan on getting to my dr but I can't even make an app till Monday.
So if you've had this happen to you please answer me. Even if it didn't cause a false bfn please share your experience. I'd love to hear it. Thank you so much in advance.