When should I get my period or am I pregnant?

I had my last period on May 5, 2011. Took a 5 day dose on days 5-9 and I thought I felt myself ovulate on May 22, 2011 I used a OPK and it said high and peak on days 5/17-5/22. I have been having very sore nipples the past week or so. No cramping, spotting, or bleeding and it is day 32 of my cycle. I normally have irregular periods and that is why I have taken 3 months of clomid now. This is my third round at first it was 50 mg once daily, then 50mg twice daily and now 50 mg three times daily. I also took plain robitussin during my ovulation period and for a week prior. I took a pregnancy test yesterday and it was Neg. I have 1 child already who is 5 yo and had no probs conciving or carrying him. I never had nausea or vomiting the last time I was pregnant. When will I know if I am pregnant or when my period should be here?