Spotting 6 weeks?

Kate

I am 6 weeks tomorrow and last night at work I spotted a little blood. dark pink. just once wipe the size of a quarter but I’m starting to think the worst and so nervous. 

last week when I found out, I spotted that night once along with the following day (I was intimate that day so doctors say that was definitely normal) those times were very light pink though.

has anyone else spotted at random times?