If it were me, I'd go and get checked out. The question of fault is a legal matter, and I am not an expert on these things. My guess is that its depends on things like: how far was the woman ahead of you when she started to move? Did she indicate first? How suddenly did she make the manouvre? Some part of the blame is very likely to fall to the woman, as she was making a risky manouvre and so should have taken particular care - which includes checking her mirror and her blind spot for other road users. But a portion might also fall to you, depending on how fast you were going and what precautions you were taking. If this becomes and important question, then I'd be thinking about getting a lawyer.