What Are The Side Effects Of Sysron-N?

Doctor i wanted to know actually last month my period was jan 13th, this month 17th i have to go out of station so to stop my periods i started taking tablet sysron from 11th of this month so almost i took 4 tablets till now on 10th i took my pregancy test it was negative but i have doubt on it i wanted to doctor in case iam preganant what is side effect of this tablet what should i do