I Was Late On My Periods For 16 Days.Done Hcg

I was late on my periods for 16 days.Done hcg beta test on doctors prescription. It was negative. Then doctor prescribed deviry 10 mg. But before taking first dose my periods started with light spotting. I was not sure to take it or not. But i took it 1 in morning and one at night. Period flow has increased. I am feeling very uncomfortable my stomach has become as very big now. i want period asap please suggest if i should complete 5 days dosage of deviry or stop it