Bub is still really tiny and sucking is comforting for her. I know that breastfeeding experts (please shoot me down if I am wrong) would say not to introduce the dummy because atm because she is trying to establish her milk supply.

However in my own opinion if you know that she is just comfort sucking and you need a break then introduce the dummy. In saying that my rule is never introduce some thing that you are not prepared to go through and ween bub off later, if that makes sense. On the flip side if you use the breast to comfort bub she may want this all the time.There is nothing wrong with comforting using the breast but you have to be prepared to want to do this. Plus bub is only 6wks old so if you stick it out for a few more weeks you might find that she doesn't need to comfort suck so much.

I personally have used dummies for both my girls because they used sucking as a comfort. DD1 was weened off by 18 months (around the time she stopped teething, is has never had speech issues but the weening process took a good month of unsettled nights. DD2 had a dummy from hospital and I am starting to ween her off now, she is 11 months.

Sorry for the rant...If you are determined to continue breastfeeding I would get some advice from a bfeeding expert about how the dummy impacts feeding.