Early positive pregnancy test

I’ve had a few early pregnancy symptoms already so I decided to take a test yesterday. I’ve taken 4 total that all have a faint positive. I still have a week before my missed period. This would be my third baby, but I’m nervous because I actually had taken a Plan B this past month. I’m excited, but definitely wasn’t 100% ready as I just had my second baby 6 months ago. Any comments or personal experiences with such early positives and/or experiencing pregnancy after taking Plan B are greatly appreciated!