Screwy cycle or possible pregnancy?

Hey everyone! I know the advice yall give is to be taken with a grain of salt since you arent my physician, but I wanted to ask before I looked like an idiot and went to the doctor. So just a little background, I found out I was pregnant on December 3, and ended up miscarrying on December 8. Before my pregnancy my cycles were exactly 30 days apart, without fail. Well I had a normal period in January on the 11th. Then my fiance and I had unprotected sex on the 18th of January and on the 20th and 21st of February and I still have yet to have a period since then. I guess the point I'm trying to make is whether I could be pregnant or if having abnormal cycles is normal after a miscarriage.