So I'm a military wife and I haven't seen my husband since August and I'm faithful to him. We tried when he was back on leave for a baby but about 3 weeks after he left again what looked like a regular period came. But now I'm 24 days late for my period for October and I've never been this late before so is it possible to have your period for the first month of pregnancy if you're pregnant hormones aren't high enough? I took a test back in August and it was negative but I'm wondering if that hormone wasn't high enough to be detected?

UPDATE: I took a test and I'm not pregnant but I still don't understand why my periods this late