TTC and positive OPKs for three days.

Okay, normally I get a positive ovulation test for one day, maybe a day and a half. Well, I got my first positive Sunday morning at 6, then another yesterday which was much darker, and two more so far today. I don't know what's going on. Has my egg not dropped yet? I'm so worried that I'm going to miss when the egg does drop (if it hasn't already). Any knowledge on this? I've googled it and it just says to BD, which is obvious. Its so frustrating