I'm currently 7, MAYBE 8DPO. I'm not exactly sure when I ovulated, but I had a very positive OPK on the 22nd and my fiancé and I dtd that night. We weren't able to dtd any other time during my fertile window as he went away to a training course for work the next day and was gone for four days, damn him
. With my last pregnancy I fell pregnant after having sex once during my fertile window, so it can happen for me! Though that was the pregnancy I lost 
I took a strip test today (not with FMU) and got what I think is a very very faint line, but I then took a FRER a couple of hours later and it was negative.
I'm beginning to think the 'positive' strip test was actually an evap, even though the line was pink. FRERs are supposed to be more sensitive than strip tests so why would a strip test be positive and an FRER negative?
Am I out if a FRER comes back negative at 7/8DPO? Is there any point in testing tomorrow with FMU?
Thanks! :)