I've had this on and off at varying intensities since Wednesday or Thursday.
According to my LMP I'm 6 weeks, however I'm fairly sure I'm earlier than that as I think I must have ovulated late. When I took a digital last week it said 1-2 weeks. It's very confusing. I didn't get a bfp until I was 8/9 days late.
The cramping sometimes feels like AF, sometimes feels like ovulation, sometimes feels like an upset stomach.
I've spent hours googling ectopic pregnancies. I'm driving myself crazy 
I've added a pic of a Tesco strip I took today and the FRER I took on Friday.