Pregnancy

Hey ladies! I know this is probably a regular question but I figured I'd ask. My boyfriend and I are VERY sexually active and we don't use protection because we're hoping for a baby soon. Any tips or advice on best times to try? When I can test? And how long does it take to show symtoms? I know a lot of people say to test before your period or that a missed period is a first sign but my period is VERY irregular. Twice now I haven't had a period over a month and a half. HELP!!!