Q1. Does anyone have an Ovatel ovulation microscope? Any tips on where I'm going wrong - I cant see a thing!?

The hole is so small and I've tried to get it to focus but nothing! It was a cheap item I bought ages ago for when we decided to TTC.
Q2. I am on CD25 on my first month TTC so I dont honestly know my cycle length yet - I'm assuming 28 this month as I always had regular periods when not taking BCP. I had serious O pains on CD14/15 and have BD'd every/every other day since CD10.
I dont feel any different at all other than one spell of nausea but that could have been through lack of sleep/not eating well.
I have a Boots own test and 2 CB digitals. I dont know how sensitive the Boots test is - I doesnt mention early testing.
When do you think I should test?

Your views appreciated!
TIA!