someone please help me understand.

Jacqueline
So my page says that I'm 4 weeks and one day pregnant. And I'm trying to figure out how that's possible. I started my period January 27 and ended the 4th of February. Everyone weekend in February I've taken a pregnancy test, although I realize that doesn't really help until I'm 6 days away from my period. 
This past Monday I took a test and t came back positive. My husband and I have had sex very little this month (don't judge not on BC and TTA) 😂 so we had sex the 4 (day my period ended)
12th and 17th. I'm assuming I got pregnant from the 17th because I was ovulating the next day.
So how in the heck am I four weeks and 1 day pregnant. Trying to understand because I eventually have to call my OB and putting it off because I hate answering these questions. I feel so dumb. Lol