My period can skip around some months and this month I was about a week and a half late and had sex. I took plan B. Now I'm getting brown discharge. However, this has happened to me in the past instead of my period but because of the circumstances I'm worried that it could possibly be pregnancy symptoms. I don't know when to take a pregnancy test because I don't know when four days before my next period will be due to the irregularities. How should I go about handling this??