How long did it take to conceive baby 2 ?

My daughter is 18 months and was conceived month one of trying doing the deed only once.

I didn’t expect trying for baby 2 would take long. We’re on cycle 3 and I’m getting BFN so I think I’m out.

How long did it take you to conceive baby 2 or more compared to baby 1? I keep seeing secondary infertility posts and am scared that’ll be us.

For reference, I’m 26 and my husband is 31 turning 32 this year.