Experimenting: OPK & HCG strips. 7 DPO

Bronwyn • 31, firefighter and peace officer, married 2 years but together 14. Our first baby!
Ok. I figured I'm going to experiment, mainly because I feel like crap most days and am hoping it's because I'm KO'd :) and it keeps me from losing my sanity.  So today I'm 7-8 DPO depending how you count it.  My symptoms: More tired than normal, sensitive nipples on and off, stuffy nose, sore throat for a couple days (better now), creamy CM, mild low abdomen cramping.  Chart has stayed high but possible dip today (see my other post on which bbt to use). 
​I decided to do a HCG and opk today.  Looks like negative for both (no surprise on HCG it's early) but I was surprised to see quite a strong line on opk.  I know there's a lot of Internet debate and not to read too much into it but what do you guys think?