Just downloaded this

I used opks for the first time this month had copper coil removed 21st march 2013 so been ttc since then no luck so I got some opk's from amazon and used my babymed app too and put in 30 day cycle and I got my positive then here's my opk that that done on the 23rd and on here said on the 24th 30.??% chance of pregnancy fingers crossed says af is due on the 8th ordered some hpt's also from amazon should be here Thursday or Monday and I will see if I can wait til af is due. Is this right that if I ovulated on the 24th but got my positive opk 23rd that I am 4dpo?? Cos I have been having sore boobs all day yesterday :( sorry for waffling on. ​