If you have actual egg whites, I wouldn't dtd without a barrier method in place. With breastfeeding, if you have the same pattern of cf for a number of weeks in a row, you can declair that to be your "infertile pattern" and not worry until things change. Once you note a change in your cf, you start to worry if it is becoming fertile.
Charting while bfing can be tricky, even after AF has returned. However, with a few months practice, you'll get the hang of it!
Laura, Mama to Mya 7/02, Ian 6/07 and Anna 8/09