When should I start to worry?

I recently just had a missed miscarriage with blighted ovum at 12 weeks... I read things saying 2 - 3 weeks of bleeding... but does that mean including the spotting? I spotted one day, then two days later I spotted again, then a day after I spotted twice, went to the hospital, kept spotting for two days, then the night after the internal ultrasound, I got my full on period. It's been a week of spotting... a week of full on period... do I go by two weeks since it started? Or two weeks full on? I only am a little worried because it seems to get light and then go crazy heavy again so I'm getting that much more exhausted... It feels like this will never end. Normally... my period is around 4 days, tops 5...even after I gave birth to my first child, it only lasted a week. Any help/advice?