Having bleeding in pregnancy is such a worrying thing I had bleeding at nearly 12 wks with my second pg and it was heavy enough to need a pad. I was so scared but at the same time confident that things would be OK because I had no pain. Coincidentally I had the NT scan the following week and it showed a perfectly healthy baby and there was a small dark spot on the placenta, which the Ob said could be where the bleed had come from. By the 20wk scan there was no dark spot on the placenta anymore.

Bleeding in pg can be old blood, breakthrough bleeding or even from sex. I'm sure that everything is fine. It is only a tiny amount. But make sure you take it easy between now and your next scan and don't overdo things