I have irregular periods. My last date of period is 16-5-2016. After taking susten 200 mg tablet my periods are came on 9-7-2016 but it was only for 1 and 1/2 day. I do urine pregnancy test at home but it shows negative. Is it a sign of pregnancy because I try for pregnancy from last one year. My lower abdomen is also change. Please suggest me what should I do.