Spotting & 6 weeks pregnant

NANCY

I have been having this spotting for 2 days now but yesterday was darker. On Friday my husband and I have sex.

1 week ago, I used to have it but it stop. Now it came back on Saturday night with light cramp in my lower back. I am 6 weeks pregnant. Can somebody please tell me what is going on. Is it normal? I have an appointment in Wednesday to do the Sonogram.

Thank you!