I know how worrying spotting can be in pregnancy, however try not to stress over it too much. I bled with both my pregnancies and have 2 healthy boys! My sister is currently 11 weeks and she has had on off spotting, a few days ago after dtd too and all is fine with her. my friend is 8 weeks and she had been bleeding too, but again all is ok. I think it is more common than we realise
Can you get an early reassurance scan?
You probably irritated your cervix when dtd. Hope this puts your mind at ease
Had same problem today. Brownish blood that turned red. Wasn't a lot but still went to the er. Everything is fine though.