Digital Clear Blue after Mirena removal HELP

[is2012it]

So, I had my Mirena taken out on 1/4. I just ordered the 1 month supply of Clear Blueasy's ovulation tests (20 ct.) - it says to use when you get your period - I havent had one yet, but belieive I ovulated on the 16/17th of January. I had 1 brown discharge "period" for about 4 days in December on 12/5, so I am using that as a base, as 1/16 - 1/17 I totally feel I was ovulating. We are going for baby #2, and do not want to waste money on the test kit by using it at the wrong time - if the period does not come my 2/5, would it be reasonable to assume I can start using this kit then if I am not pregnant?
Any advice on ovulation kits after mirena would be great