Heya! I'm a breastfeeding mom too (my daughter is 32mths!!! I know!!! We're planning to stop when she is three in July) and I have been charting for over a year. My AF came back when my daughter was 9mths but despite ttc and one early miscarriage I have discovered - thanks to charting - that I suffer a short luteal phase (time between Ov and AF). Whether that is because of breastfeeding or not nobody can seem to agree and I am taking alternate methods (vitamins. vitex and B6) to try to solve it without weaning.
I have a mixed view on charting. It is wonderful and you can learn so much about your body but it can also add stress and an obsessive stress if your constantly looking for your ovulation and waiting for a BFP and that in itself might make getting pregs harder. I'd say if you are not ttc yet you could put off charting and do the 'not trying not preventing' so you might just get a happy surprise! As you concieved easily first time round it is very likely!
Plus if you are not ovulating yet - or not even having AF - it might get a bit tedious as you are really looking for a pattern and temp shift which you won't get.
If, after a few months of not trying-not-preventing you don't fall pregs (and are having AF's) then I would say chart to see what is happening but at the moment take full advantage of your no-pressure relaxed attitude!
HTH
Jo xxx