I am married and sexually active. I am having birth control pills for a few months. But I missed my period last month though I had a 5-6 drops of blood and the usual pain during my due week but not period exactly. This month, I am having the pain which I usually have but there is no blood. So technically I am not having period for 2 months. I have done pregnancy test 2 times but it is negative. I am over weight. What medicine should I intake to have my periods instantly?