have been doing ovualtion tests this month no sign of ovualting?

If your last cycle was 20th Feb. and you're on a 28 day cycle, then tomorrow is day 14 which is about when you should expect ovulation. Keep testing, maybe even twice a day to make sure you don't miss it. You are entering your peak time so your positive should happen very, very soon. And I hope you've been having regular sex the last few days! Its better for sperm to already be waiting for the egg when it drops.

Good luck!

theres still time it may not have happened yet, some people have a shorter luteal phase which means you might ovulate later in your cycle nothing to worry about just keep testing at least twice a day, if you only do it once you may miss the surge and assume you never ovulated when you did. if you dont get a positive at all then speak to your doctor. having regular periods is a good sign that youre ovulating so i dont think you should be concerned, sometimes opk dont work for everyone.

Well, as you have a 28 day cycle (max) and assuming you have a 14 day luteal phase (can be shorter or longer) then you won't ovulate just yet. You will ovulate about 14 days before your next period, so around the 6th. Howvever a luteal phase can be as short as 10 days in length, meaning you won't ovulate until the 10th March. No surge has been detected cos it's not time to ovulate yet.

Wait until you have had another period without ovulating and then go to the doctor (internist) and have your thyroid checked. An underactive thyroid can keep you from ovulating. Also, a high normal range for the thyroid needs to be treated so get the number and don't accept high but within range as an answer.