Does Bleeding After Urination And Delayed Period Indicate Pregnancy?

I have an irregular period. I was to get my period on june 1,2011. I had sex on may 27,28,29,30,2011. Took a pregnancy test june 10,2011.early urine came negative. I went to pee june 11,2011 and a drop of blood came out. Now I only bleed after I urniate just spots. No cramps,no bloating, no tender breast. Could I still be pregnant? And was I ovulating at the time I had sex?