DD she's probably cluster feeding to help bring the milk in. Good to hear she was attaching well on both last night. Sore boobs could be from her feeding so much or from not being on properly, or just being rough. Feeding settles down so much once milk is in properly, also it can take the first couple of weeks to 'practice' & find out how you both like it. I've had 3 bubs & B/F all & they all had their own little routines. Would you believe my girl was the roughest feeder too.......

Best of luck! Enjoy it, its priceless.