Cycle day 36

Hey everyone. My period is always between 25-28 days long. This cycle for some reason I am on day 36 with no period in site. I had some signs last week I thought it was coming and than nothing! I’ve had lots of discharge and not much now. I haven’t taken a pregnancy test yet, simply because I don’t believe my husband and I have had sex since February or March (he works crazy hours, I’ve been watching our son and timing just hasn’t worked out). The last time I missed my period was 4 years ago when I got pregnant, I’ve always had regular periods my whole life. This has me stumped! I did start a new supplement for my liver in April but I don’t know what that would have changed anything. I’m going to take a pregnancy test tomorrow morning but I’m assuming it will be negative. Anyone with any ideas? I can’t call my family doctor until Monday!