hi mamsh! please go to your OB na po.
From my experiece (this is my own experience and others may have different experience from mine)- I also had spotting sa second pregnancy ko. same po sa inyo. for a week po tumagal saka palang po ako nakapagpacheck up sa OB. I had subchorionic hemmorrhage and also threatened abortion. andami ko po resetang gamot. 3 po na pampakapit and ininom ko plus vitamins. naka bed rest din po ako.
Yan po is base sa experience ko lang. Visit your OB po as any spotting during pregnancy is not normal.