I have my menstruation period for already 1 week and 3 days now. I was alarmed when I saw so much blood in my pad and I also saw big dollop of blood (the size is like cherry tomatoes) every now and then.. What should I do?

Considering how long its been and how heavy, you might consider calling your doctor. It could be perfectly normal, but its worth mentioning in case its also causing anemia.

Well it depends on how long this has been happening? You would know if you was having an miscarriage you would be in extreme pain normally stress or some kind or worry can cause clumps in your period or if your periods late maybe go to a doctor if its worrying you too much hunny