Is this normal

Hello guys! Currently nursing my 14 month old son at night only. I got a pretty normal cycle last month and have been tracking ovulation this whole month. I was pretty sure I ovulated about 2 weeks ago and should have gotten my period today but nothing. I have continued to test for LH and they all seem positive or close to positive still all my pregnancy test are negative. Last month this was not the case after my surge 2 weeks later I got my period and my opk’s were not positive anymore. Is this normal?