How long does usually a couple try to get pregnant?

Tanya
Hi guys,
​I am pretty new to all of this. I stopped taking my birth control pills in February, but my boyfriend was not ready to have babies just yet. Finally last month he decided we can start trying. We had sex without protection last month, but I didn't get pregnant. My question is for a healthy couple in their late 20's what is a normal timeframe to get achieve pregnancy? Any thoughts?!
​Thanks!