i think i had last intercourse in the month of march, i missed my periods in april, so i did a pregnancy test in may around the 2nd may- it came negative, as i had PCOD, i thought it could be delayed because i used to have problems of irregular cycles. however on 12th of may slight spotting and 2 days light periods happened. after 15th may until now the end of july i again did not get my periods.Today morning I did my pregnancy test, it came positive. Now I am confused if I am pregnant or not because i had negative in May and positive in July. And if i am pregnant how did it happen after 4 months of intercourse. Please explain.