Only way to know is to take a test. It's a possibility since you missed your period but not the only reason you can miss a period.
You should go to your nearest walmart, target or basic grocery store, buy a pack of pregnancy test and take one. I bought a first response box that came w 3 **** sticks for $7 I think. Don't take them all in one day. I took all three of mine throughout the week so I could feel better about the answer being what it was. If that makes sense...?