Confused.com

Ok. So how exactly does counting when your pregnant from actually work, i had my last period on 4th of November! Then me and my boyfriend broke up and didn't have sex for over 2/3 weeks, I took a clear blue text two days ago and it's came up positive and 1-2 weeks pregnant! Which yes me and him had sex for the first time in 3 weeks 2 weeks ago. So that would be accurate.

But then glow asked me the date of my last period and has me down as 9 weeks pregnant! I am NOT 9 weeks I am 1 or 2.