So I took my mirena IUD in October 23rd , 2020. I didnt get a period until december 15 and lasted about 5-6 days. I went through a crash for a month all the bad anxiety and headaches and vertigo. It was horrible and my doctor kept saying I was fine but I felt off . Husband and I started trying to get pregnant Right away and had last period february 1st and only lasted 2 days . It wasnt heavy so it was probably implantation.Tested on february 25 5 days before period and tested positive . I Should be about 4 weeks pregnant.