miscarriage: what's happening?

sorry ladies i know theres been a lot of MC posts on here lately and i hate to be another one posting but i need help. I started having my miscarriage a week ago today. my HCG had been in the high 1000s and when they told me I was miscarrying my HCG was 108. I've been bleeding since that day but I'm having pains like I'm still pregnant. my boobs are killing me. like awful killing me. Is that normal with a miscarriage? to still have pregnancy like symptoms a week after I started my miscarriage? I was only 7 weeks along. I figure I should add I haven't been sexually active since finding out I was miscarrying also. any advice would be great please I'm so very confused.