On 6th April I got brown color discharge , which I usually get before periods bleeding starts. So assuming it to be periods I used sanitary napkin. My last period was on March 9th. But till night there was no blood drop.on the sanitary napkin, just few brown drops,not red. Also I did not experience any stomach ache which I usually get. Second day too napkin had brown spots, and same on the third day. I did home pregnancy test on the third day with the first urine sample in the morning. It turned out to be negative. Please suggest what to do.