I am not a doctor or will pretend I am but pregnancy shows through more than just your belly. Have you had any symptoms recently? Nausea, increase or decrease appetite, tender or full chest?
You should take a pregnancy test just to be sure however know that a missed period doesn't always mean pregnancy. Sometimes a missed period can come due to stress, significant weight gain or loss and at times its a underlying disorder like PCOS (which is not life threatening at all)
Take it one step at time, take a pregnancy test and start to rule out possibilities.
All anyone can do for you is guess. As long as you've had sex, protected or not, there will always be a chance of pregnancy. What you need to do is to take the test whether at home or book an appointment with your doctor for a blood test. Pregnancy symptoms can be very similar to other illnesses or to the signs of a coming period. As well, periods can be missed for a number of reasons. Also, if this was you were pregnant, your symptoms likely wouldn't show up so soon. Regardless, missing a period is a major sign of pregnancy, so take the test.
That isn't the symptoms of early pregnancy. If you are worried, take a pregnancy test and know that everytime you have sex there is a chance you can get pregnant.
None of us here can tell you if you're pregnant or not. Like Janice said, all we can do for you is guess. So take a test.
We can't tell you whether you are pregnant, you need to have standard check!
Probably. Take a pregnancy test.