Spotting while pregnant

Hi po, i am 8 weeks pregnant. ask lang kong pwede possible reason kung nag spotting ako for two weeks could it be dahil po sa old blood po coming out? O pagbabawas lang? I am not experiencing cramps or anything aside from spotting. Like light brown to pinkish siya konti lang dn po. I already went to the doctor and they gave me pampakapit na rin at folic acid . Pero ganon pa din. Please i need encouragement and baka sakali may mga moms na naka experience nito pero ok lang ang kinalabasan.