Late positive test?

L

I barely got my first period since having my son at 9 months post partum which was December 9th. My husband and I had more than one slip up and I took tests and they were all negative UNTIL today I got the DARKEST positive and I’m SHOCKED! If I base it off my last period I’m technically almost 8 weeks pregnant! Anyone ever not test positive until this late or do you guys think there’s a possibility I’m not that far along? With my son I planned everything so I knew what day I conceived and all that fun stuff and now im just confused lol