Delayed period

Problem

I am currently 4 days late for my period. My boyfriend and I had sex on January 22, right after my last period. We’re not very sexually active since we’re in a long-distance relationship, but we did use a condom. My period was supposed to start on February 16, but it still hasn’t come. There are signs that I might have cramps, but they’re not consistent—they come and go. I also noticed some white discharge. What should I do?