Anyone gotten pregnant 6 months after a c-section? Is it ok?

My doctor told me I need to wait a minimum of 18 months before I start trying for baby #2 but I really don't want to. My daughter is 5 months and I just pulled out my IUD. I hate feeling the strings and I really do want a second close in age.

For mamas who had two c-sections close together: is it ok? You hear horror stories online but I've never heard of anyone having anything bad happen.