luck with opk's?

Katie
hubby and I have been trying to conceive for a couple months now. well this month I decided to track my ovulation using opks because of my erratic cycle due to breastfeeding. Monday I got my first positive opk and we DTD that day and the next. I'm sooo hoping we are preggers :) I'm assuming the chance would be large, but I'm not sure since I have no experience with the opks.