Ahhh I know how scary it is to see any spotting, especially when it happens more than once! Honestly, brownish spotting at 17 weeks is usually less concerning than bright red bleeding, most of the time it's just old blood clearing out, especially if it's just a tiny bit and happens once. But here's the thing, since you've had it twice now (at 15 weeks and again now), it's worth getting checked out just to be on the safe side and put your mind at ease. A lot of mums I know who had similar spotting went to their clinic or hospital for a quick scan, and everything turned out fine, tapi better safe than sorry kan. In the meantime, try to rest more and avoid heavy lifting or anything too strenuous. Definitely mention this to your doctor or specialist at your next appointment, they'll want to know the pattern and can do an ultrasound to make sure baby's doing well.