Ovulation questions

Ok so I haven't had a period since August have taken 6 or more pregnancy tests and all negative so I decided to try ovulation tests to see if I'm constantly ovulating and that's what could be keeping me from my period. I took one last night. Positive for lh surge and again this morning another positive. How long can I keep getting positive ovulation without out it being out of the ordinary. When is ovulating to much. I'm worries if I'm constantly ovulating that I may go into menopause early.