Since you just got her, Id just start tracking her weight with a kitchen scale. Look for an increase. Scales are pretty cheap at home depot, or the like.
Also check her belly for nipples. Depending on if she is pregnant and how far along she is, those should appear. Behavior is also a clue. Any nesting? Changed attitude? Missed heat cycle?
Also check her belly for nipples. Depending on if she is pregnant and how far along she is, those should appear. Behavior is also a clue. Any nesting? Changed attitude? Missed heat cycle?