Period & Sore Nipples & Cramping

So Me & My Boo Had Sex Sunday & He Used A Condom . When I Got Up I Had  Light Pink Blood Spots In Underwear & A Little Bit Of Blood Clots & The Day Before I Was Cramping Really Bad & Having Really Bad Back Pain . Now Today My Nipples Are Sore To Touch & Even When I Wear A Bra .....Please Help Me To Figure Out What This Is