I've had light cramps since yesterday - hoping implantation. When can I test for a BFP?

your symptoms may be implantation. Implantation occurs anywhere from 7-12 days after ovulation. so, you might be implanting now. The body starts producing HcG in higher levels once implantation has occured. SO, it is probably too soon to test. Why don't you go to Dollar Tree and get a test for a buck, then you can try without wasting money! They are accurate to 20 miu's. that's probably as sensitive as your expensive ones are! babydust