Opk as a pregnancy test

This would be just for fun so no rude comments please.  (I know the difference between the hormones the pregnancy test picks up versus the opk btw before anyone starts pointing out the obvious ) ?
Anyone actually try using an opk as a hpt with a strong result and had a positive pregnancy test later on? I'm curious since I read somewhere that it could detect it if one was pregnant. 
​the reason I ask is cuz I had a +opk a week ago Wednesday and Thursday so I stopped testing. I have been cramping, dizzy and occasionally nauseous since. Just for the heck of it I took an opk today (since I'm too early for a HPT) and it was very positive. Not trying to get my hopes high but by now I should have a negative test. 
​What do you ladies think??? ?