Hey A.! I don't think you could have hurt your baby at this point in your preganacy. The only thing is that I think you have to keep your body temperature from getting to high in the 1st trimester and take breaks in your excercise routine. I'm a martial artist too,(Tae Kwon Do), and I was at green belt level 10 years ago when I found out about my 1st pregnancy. I kept going to class until around the middle of my 3rd month and even did a belt test during the 2nd month; At that level, the tests were not physically strenuous or anything; otherwise I would not have done it. Anyway, while I was still attending the classes, I was careful not to get to hot and never sparred or anything like that. I just worked on stretching, forms, and things of that nature. I kept on stretching throughout my pregnancy as much as I could. As you might imagine, that got more and more difficult as my belly grew; but even just a little stretching helps. Also; I kept practicing my forms so that I would not forget them when I went back to class. After my son was 3 months old, I went back to class without missing a beat or having to relearn everything. I just had to build my endurance up again, but that's about it and it didn't take too long. Plus, my body popped back into shape rather quickly. Talk to your doctor about it all, but I would just suggest keeping your mind sharp on your skill while your pregnant; even if your body can't cooperate at times. Good luck and congrats on the new baby:-)
R.