How far long y’all I think I am? Because I’m a little confused

Cassie🦋 • 👼🏻 👼🏻.. 7year old son👦🏻 23🌻 baseball mom⚾️

So I had my Period in December for seven days 14th through the 20th I had sex on the 24 and 27. It’s been exactly 3 weeks so I feel like I found early but my phone says I’m four weeks and 2 days.  yes I will going to the dr soon. I just wanted your opinion because it’s counting my period as a week.