Can I be highly fertile right now?

Sam • •Married💍• Momma to 4 ( including twins)• 5 losses👼🏻•Aps•

I got the clear blue digital test and it’s been 2 days since I stopped my period I do have long like 5-7 day periods but it says I shouldn’t be fertile for like 3 days. I took the test though and it is a flashing smiley which means highly fertile is it a fluke or it’s probably true? Won’t hurt to have sex anyways lol.