This link might give you info you can use: https://www.breastfeeding.asn.au/bfi...-contraception and this link: Breastfeeding & Fertility | Ask Dr. Sears® (obviously twisting to suit making a baby!)

This link https://www.breastfeeding.asn.au/bf-...solids/weaning contains this:
Return of menstrual cycle
If you have not already done so, you will most likely resume your normal menstrual cycle after weaning. However, as menstruation can resume before weaning at any time from a few weeks after the birth of your baby, no predictions can be made about when an individual mother will resume her menstrual cycle. There is no need to wean because of the return of menstruation.
Some mothers notice that their babies seem fussy a few days before their period starts and for the first couple of days of the cycle. This may be due to premenstrual tension in the mother or fluctuations in her milk supply. Changing hormone levels in a mother's body causes both of these. It usually settles down quickly, particularly if the mother is able to fit in a few extra feeds to boost her milk supply.
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Apparently the average is 14.5 mths for the return of periods. My norm seems to be 18mths, I have known women who are closer to 24 mths...your time will come.

LLLI | Boosting Fertility while Breastfeeding this one might help too.

Seems a 6 hr break over night helps, and 4 hrly spacing in the day...but it varies so mauch from mum to mum..best to do what feel right for you, I think. (gaining knowledge is power!)

http://kellymom.com/bf/normal/fertility/