Late with AF two negative tests and one pos!

Lisa

I’m a week late. On the 13th I was suppose to get my period and when I didn’t I took a test which came back negative. On the 16th took another, again negative! However , today I look one and it was positive! My lmp was 12/16 I’m usually around 30 days however last month I got AF day 35. I also noticed I had pos ovulation around day 22 of my cycle. Could it be I was testing too early since ovulation was a bit later? Have an apt with gyn next week.