My menstrual cycle was due today, no signs of it. Stressed in past. If stress delayed it will I still get one this month if I'm not expecting?

Menstrual cycle. Many things may alter the menstrual cycle including stress so relax and let your body takes its course assuming you are not pregnant. You may just have a delayed period.
Pregnancy? Take a pregnancy test. If it is negative, relax as missing a cycle or 2 is not uncommon and doesn't necessarily mean that something Is wrong. However, it is always important to rule out pregnancy first! Stress can certainly cause changes in the menstrual cycle.