Yes spotting from 6 to 8 weeks. Try to bedrest as much as you can. Rainbow baby for me too. Just take whatever medication your gynae has given you. Try not to worry or stress so much ya. I know its hard trust me! Seek your gynae advice as well for assurance.
https://sg.theasianparent.com/implantation-bleeding-or-period-how-to-know-the-difference