Babies back to back

I'm not pregnant now but when I do have my children at least for the 1st two I will wait a few months then start trying again ..a little history I have lupus and pcos and my Dr told me that kids will probably be out of the questions when I get in my 30s (I'm 24 and married now) i had a late term lost at 17 weeks two years ago and my ob told me to wait a year after my loss to Start trying again but I've seen ppl get pregnant right away after a baby I feel like when the time comes I will TTC as soon as I this a bad idea?