Hi Rose, those symptoms are a sign. I got my BFP a couple of weeks ago, I think I'm about 7 weeks at the moment. So far Yasin and I haven't had any issues with breastfeeding. If the flavour has changed it doesn't seem to have worried him and I haven't noticed any supply issues. At the moment I'm breastfeeding Yasin 3-5 times in 24 hours.
I've noticed that I seem to be alot thirstier now than I was pre-pregnancy. I don't remember being so thirsty during my first preganacy so I thought that it could be related to breastfeeding.