Hi everyone I need advice!

Hi I'm 21 years old . My last period was March 5th and I haven't had my period since . I was suppose to get my period in April but on the day of my period I only had a brown dishcharge for a day or two . and nothing since . me and my hubby had unprotected sex constantly for the past three weeks . We are trying to convince but nothing . When should I take the pregnancy test ? Am I even pregnant ? idk what to do this would be the second month I haven't received my period . I had taken a pregnancy test twice last month and still nothing . I need advice :( Also my period is irregular . But idk if that's supposed to mean anything .