You are only pregnant when a healthy egg met a healthy sperm and implanted. The most obvious sign is that your periods stop. You will also get a positive pregnancy test. All other early signs are different from woman to woman and can also be confused with PMS or something else.

The first outward signs will be from month 3 when you will begin to see your tummy change shape when you are nude. You will also notice your pants fitting tighter.

yes. but some other common signs are nausea, and cramping that can be confused with period cramps. But the only real way to know is to take a test!