Hi caija - I think I posted on your other thread when you weren't feeling well.
It sounds a lot like the spotting has been caused by sex, which is very normal, but if you are really worried phone the out of hours doc and see what he/she says.
When I was pregnant with DS I had 2 full on period-like bleeds (11 weeks and 13 weeks). There was no reason for them at all.
I MC in October and am currently 8+5, and have had 2 scans. The first was at about 7 weeks and was unrelated to the pregnancy (to check my ovary for a cyst). They confirmed pregnancy/heartbeat while they were there, and said that they could see a very small area of bleeding (they called it a bruise) below the embryo. When I got home I started cramping really badly, and eventually spotting. The cramping (which was soooo painful!) turned out to be caused by diarrhoea, which lasted just over a week and has left me a bit fragile still - I have to be careful about what I eat.
After the spotting/cramping, I was sent for another scan on Thursday and everything was okay still. The area of bleeding/bruise had disappeared. They couldn't see any cause for the spotting. I am still spotting now and trying not to let it freak me out too much - easier said than done though.
My GP said that it was possible that the diarrhoea, or more accurately the cramps, was causing the spotting, but that it was no reason to be concerned. That the only real problem was the stress that it's causing me. She said that as the cramps were sometimes so forceful, they might just be forcing small bits of old blood out.
She said she couldn't prescribe Immodium or anything similar for me, but as it had been going on for so long she gave me a low dose of codeine instead, which has a constipating effect. She also said to keep hydrated, eat low fat foods, not to eat too many high fibre foods, and to eat little and often, so 6 small meals instead of 2 full-size meals. I do feel a bit better, so I'm hoping that the spotting will stop soon as it is nerve-wracking.
Sorry for the essay - I just wanted to get eveything in. I do hope you feel better soon. Hopefully, if you can get your tummy trouble under control everything else will start feeling a bit better.