Miscarriage at 7 wks, started B.C. The following week.

It was my first pregnancy and then I miss carried at 7 weeks. :( My doctor had gave me birth control to start and I did, it was exactly one week after our loss. It's been 9 days since I started taking it, and I feel drained and mad/upset a lot about everything. Is this normal? Should I have waited longer  before starting the pill again?