what is going on?

Before the last time I had sex I had my period on and off for the whole month. Then I had sex then bled again for a couple days after. That was back in October. I have since ran out of my birth control which helps maintain my periods (I am not having sex ATM since my boyfriend broke up with me a week after we last had sex) I haven't had a period since. I haven't been experiencing any pregnancy symptoms. I was extremely  naesous one morning back in November. So I don't think I am pregnant but I am worried since I haven't bleed. I have had cramping and ovulating as well.