I wouldn't worry, just rest and if you have heavy bleeding and cramps go to the er.
This can be normal. Is the blood bright red? If so it can be the start if a miscarriage thats how I started. I had a miscarriage a month ago. Make sure u rest abd if bleeding gets worse contact ur doctor.
I had some spotting around 7 weeks and cramping too. It was very small spots just on the tissue. I was so scared. I am now 29 weeks. Hang in there, scant bleeding in the beginning can be normal. I nearly drove myself crazy with worry. Congrats.