No Mense CD50 27dpo

I stop taking BC in Nov 2009 and been taking Vitamin D 2000IU and been getting my period until this month. LMP was Feb 14, 2010 and my chart told me I ovulated CD 23. My cycle for the last 4 months was 33 days but it never came back this month. I'm not pregnant and I been stress out but still no sign of a period and now my CM is EWCM for the last 2 days. Am I going to ovulate again? I dunno if I should buy an OPK  to make sure if i'm going to ovulate twice in one cycle or I had a "periodless" menses. (I don't think ovulating twice in 1 cycle)