Could b pregnant

I knw they say every pregnancy works different in people, but I had two kids already n miscarried one, I recently started feeling nauseated n having some other pregnancy like symptoms, I just had my cycle bout a week ago, n it wasn't normal, it lasted for 3days n I normal have it last for 4 to 5 days no more no less, n last month my cycle was normal, n month b fore that, it was normal, I'm just curious, could I b pregnant, have any other people experience something similar to my situation, I knw strange symptoms happen when u get pregnant or if u don't knw..