My cycle day in confused please help!

Ok I so at first I spotted only once on the 3/9. At first I thought implantation bleeding but then spotted more on 3/10 and on the next day 3/11 my period came heavy with cramps. Now which day is my cycle day 1 ? I usually ovulate on the 14-15 cd and I have been using the clear blue advanced fertility monitor and I should have hit the 2 bar by now I would think. I'm starting to get worried. Is it possible to not ovulate on the same day every month?