I got my birthday control removed December 14 and had a normal period December 29- Jan 3 the Ovia app told me my fertile window was January 9-14 I had sex on Jan 4,5,7,10,11,14 and 16th and I started having sore nipples on the 24th up until I was suppose to come on my period and that was suppose to be Jan 26 and I didn’t which I told the app and it old me to take a pregnancy test and I did I took two and they both came back positive and I also went to the hospital and they confirmed and said it was too early to tell how far I was. This app today is telling that I’m 6weeks and 5days but I went to the hospital on the feb 12 and they said I was measuring at 7 weeks and 1 day can someone please explain to me how that can be