How to tell?

How can you tell if you're pregnant or not without a test? I've had what I think was a period. I bled for 5-6 days, filled a pad, there were small clots at times, dischargey blood on the last couple days and the usual brown shit at the end. Is this a period? ALSO...my boobs hurt before my period but then stop after my period. Is that just my period symptoms? Not pregnancy?