Re: Still not menstruating...
You're in the exact same position that I am. My son is the same age and I haven't seen the return of AF, and we've been night weaned for several months. My son also only nurses 3-4 times a day at this point too.
I have started taking Vitex (available at GNC) to help boost my progesterone and get AF going again, but you have to take it for several months for it to really start working. It's safe for breastfeeding, and some women actually have a supply boost while taking it.
I might be one of the women that has to wean completely to see AF return and I've accepted that. I'm not pushing my son too hard and although I would love to be pregnant by the time he turns 2. If it's when he's between 2-3 I'm okay with that. I would rather have my own personal pregnancy agenda delayed 6 months then wean him in a hurry over it. It was hard though, I still struggle with this because I'm an older momma and I just had in my mind I need to be pg when he's 2. LOL.
PM if if you have any questions about Vitex. Good luck!!!