Positive and negative at the same time

I've had a flashing smiley for 5 days. Then this morning it was a solid smiley.

opk strip tests continue to come back negative still.

Do you think tomorrow the strip test will show positive?

Background information, I'm 5 1/2 months post partum. Exclusively breastfeeding. Originally had the IUD at my 6 week check up. It slipped out of place within a few days and was causing severe pain so I had it removed and went on the mini pill. 2 weeks ago I went off the pill due to negative side effects.

Since I haven't gotten my period back yet I'm testing for ovulation to prevent pregnancy until we are ready for another in a year or two.