Withdrawal bleed?

Samantha

I was only on the pill for a little over three weeks due to serious mood swings and getting distracted with the holidays. I forgot to take my pill one night and by the next afternoon, I was spotting which turned into light-medium bleeding that only lasted two days. So my question is, was that my period or withdrawal bleeding? And, how do I figure out my cycle now? I have no idea what to expect or when I’ll ovulate!