I'm wondering....could I be?

July 31 period began and ended on the third of August. Next following week...light bleeding (twice that week)...next following week light bleeding again.(never had this happened before) and now today is the 30th and period should arrive tomorrow yet no symptoms of it coming....could I be pregnant? When do you normally realize you're pregnant second month? I don't want to take a test JUsT yet....anybody had this happen and found out they were pregnant   all along?