help a sister out ...

Kates
Here's the deal...I've had four days of brown spotting no signs of actual AF blood
FOUR 
I've never had more than like one or two 
I took a negative test at days 10,11, and day 16 
My cycle is also going a lot longer than usual 
Has ANYONE out there ever heard of that much spotting and still getting preggo ?!
😩I'm desperate here , confused and desperate