Implantation bleeding?!

Ky

So my period is late by 3 days. I’ve taken a few first response pregnancy tests and they all came back with VERY faint positive lines. I’ve taken like 4 and they all look the same, super faint but there. I’ve been experiencing nausea while I’m at work, it comes and goes and has never made me throw up but I do gag a lot for no reason. I’ve been wiping very light brown for the past few hours. cramping constantly but it’s nothing severe, they’re pretty mild. Kinda feels like I’m about to start my period but I’ve read up that a lot of girls feel that way when they first find out that they’re pregnant. I’m supposed to go to the doctor tomorrow to hopefully get confirmed for pregnancy but I would so hate for my freakin period to show up after all this excitement! 😣😞 can implantation bleeding even start this late? I thought it was supposed to happen before your period? I’m so upset. 😞