Which one was it? Have you had it removed recently? I had the marina one for 14yrs took about 5mnths for my periods to become regular and "normal".
Did you have inter course while ovulating, what's your average cycle length and as previous post when are you due ? Do you have any symptoms. Need this sort of info to point you in the right direction. If you were due when you took the tests then you might have to wait a little after. I was 10 days past before i finally got my positive. Best wishes x
When was ur next cycle due?