TTC baby # 3

My husband and I have just recently started trying to conceive. Recently my period was irregular. I started a cycle on December 14, had a period for 3 days and then it stopped. I got a positive ovulation test dec 22. On December 29th I ended up back on my period for another 3 days. Starting Jan 1 I started testing for LH. My tests have all been negative and seem to be getting lighter. Has anyone had this happen but still ended up having a positive ovulation test? I was having some mild cramping today so I took an LH test this morning and evening and bother were negative.