Annoyed!

This Is really annoying. And a little frustrating. This is my first month off BC. I had been on it for 8-9 years previously, and I was a young teenager and honestly don't remember if my periods were regular or not. So we've been TTC this month, and according to my app & when I was on the pill, AF is due in 3 days. Of course though since coming off the pill idk when it might show! Well since last night I've had some brown spotting and mild cramping. I have my hopes up that what if it's implantation bleeding?! But at the same time I'm thinking it could just be my period trying to start & my body is out of whack coming off BC. Anyone else gone through something similar? I just want to know if this is my period or not 😞