Trying for our second baby

So I came off the pill a week today I’m currently on day 4 of my withdrawal bleed and I’d like to know if I have to wait for my first actually period before we can start trying for a baby?? With my first baby I got pregnant while on the pill and now we’re actually trying for our second baby it seems completely different to having my first as it just happened and we didn’t know where’s now we’re planning on having our second I don’t know if I have to wait for my first period or if we can start trying after my withdrawal bleed has finished??