Symptoms 3 weeks after taking Plan B?

I took Plan B on my honeymoon...36 hours after having . About 9-10 days later, I had a short period that was accompanied by a brownish discharge. One week after the abnormal period, I started experience light cramping, bloating, constipation and nausea/indigestion that happens almost nightly. I discovered that I was ovulating while on the honeymoon (maybe the day after ), so I'm concerned. Any insight would be appreciated.