Hello P.-
I went through the same thing while I was nursing my son and wanting to get pregnant again. I talked to the doctor and did some research and granted a lot of women are able to get pregnant while nursing, its usually hard to. I stopped nursing at 13 months and now 5 months later am finally on a regular cycle and hopefully this summer we can get pregnant again. But really you just have to look at what is more important, continuing to nurse your 21 month yr old or trying to concieve another one? What are your nursing goals, how long do you really plan on nursing? This could be a great time to start weaning and getting ready for baby #2. After stopping nursing completely it took about a month to get a period, it took me about 3 weeks to wean, slowly cutting back from 3 to 2to 1time a day and then done, no bottle or anything. So, just look at what you want to do, start baby number #2 or nurse your 21 month yr old? But really, anything else, good luck with. I read books, and tried talking with the doctor to find ways around it, but nursing just stops your body from doing other natrual things, I tried for like 6 months (nursing and getting pregnant) but no luck then my hubby deployed so I was out of luck. But good luck and I hope you figure it out.