I have also been a lot more stressed than this, and still had a regular
menstrual cycle. If it makes any difference, I just started have sex in early July, but all protected. Condoms were checked before, even during, and after to make sure they didn't break. What else could cause my period to be so late, or miss it altogether?
My regular menstrual cycle is around the middle of each month. Most of the time between the 10th and 15th.