Negative tests, no period.

Ever since last year, with a failed pregnancy, my periods have been close together than normal and the length of my period varies. However, my last period ended June 15th-ish, and I haven't gotten one since. Since my miscarriage in November, we have been trying again (without monitoring my ovulation cycle until a week ago). My miscarriage was due to neglegent doctor's that rufused to detect the RH- in my blood. I'm terrified that if I am pregnant, the blood antibody will harm the baby or cause a miscarry before I even can detect the fetus on a home test. Any thoughts? Does anyone think I'm pregnant, or is my period late? I need a tid bit of comfort on this subject, because I know my body well, and it doesn't seem like my period will be here any time soon...