Yes, I did conceive immediately after coming off bc pills. For some women, the huge rush of hormones makes them incredibly fertile. I was one of those women. Unfortunately, it ended in a very early miscarriage, which is also possible since hormones are so crazy and unstable. After that it took me 13 months and one round of Clomid to conceive again. But I also have an ovulatory disorder which is why I was on bc pills to begin with.
So yes.... definitely possible.