Kellee,

When OPK's come up positive, it means you'll likely ovulate in the next 24-48 hours as it picks up the hormone that triggers ovulation. It's a urine test like a HPT. Can be a bit of trial and error especially at first, so try buying a few packs at least. One of our advertisers sells very cheap HPT's and OPK's - check it out in the Products & Services Directory in the "Recommend a Book or Product" forum.