Ovulation test as HPT?

I had trigger shot on 21st and iui on the 22nd of last month and i keep getting positive home pregnancy test since 9 DPO and they keep getting darker so of course I keep taking them just to make shire I'm not just crazy or it is just my hcg still in me. I ran out of test so I've been using ovulation tests everyday just to see if they are geting. does that mean I may be pregnant if they keep geting darker? Dose opks even work as hpt?