Does a withdrawal bleed mean that I’m not pregnant?

I just came off of the mini pill mid cycle because I Could. Not. Hang. With the side effects. I felt like I was first trimester pregnant x10 since I started taking it. No, thank you.

I stopped yesterday during the third week of my pack. I have some bleeding now...48 hours after my last pill. I am assuming that this is a withdrawal bleed?

Does that mean I am not pregnant? The reason I ask is that I didn’t take the pill at the exact time every night (because I wasn’t informed). So there is some concern that this mini pill wasn’t as effective as it could have been.