The Pill/Periods

I've been on the pill since about June up until December when I broke up with my boyfriend, so I've been off it for about a month now. While I was on the pill I was getting a light period every 2 weeks or so, even more some times, I was very irregular! Yet since I've been off the pill and the pill I've only gotten one very light period that lasted 3 days, which was a month and a few days ago.. I'm wondering if this is normal for anyone else? I was expecting to have had a period again about a week ago but there's been nothing.. I also recently got back with my boyfriend and we've had sex since but used condoms and were safe. I'm worried I could be pregnant because I haven't gotten a period.. Anyone ever experience this after getting off birth control???