What’s the likely hood?

Sooo I had what I thought was my period on Valentine’s Day... my periods are usually very very heavy but this time it was like brown/light pink then 2 days light but bright red then 2 days brown again... well last night not even with first morning or holding it or anything I took a test and it was DARK right away like before the pee went across it was there already ... was the likely hood that maybe that wasn’t an actual period ?

Edit to add.

I mean like that I’m 7 weeks not 3 weeks....