Implantation bleeding 4 days apart

Hi everyone,

Has anyone ever had implantation bleeding/spotting 1 x on two different days that were 4 days apart? I had one episode of spotting Monday and another this morning. Both we’re isolated and did not occur again that day. My doc said it’s likely implantation because I’m getting darker pregnancy tests each day.. just curious if that has ever happened or if this could mean I could be having twins? 😬