Could be things were too rough. If it keeps up beyond one time, go see your gynecologist for an examination.
You should see your gynecologist to get your hormone levels tested. A good thing to do that will really help your doctor track your symptoms is to keep a calendar. I have an app my phone that is really good; its called My Calender (android) Keep as much info as you can. Do you use condoms? Before I was married, my husband (then boyfriend) and I had to use sensitive condoms bc I have a latex allergy and it would cause me to tear...