When you’re really stressed out, your ovaries might put a halt to ovulation temporarily. This may depend per woman. Some women’s ovaries might stop with a short but sudden bout of stress. For most, however, it will take long, continuous periods of extreme stress before ovulation is affected.
In a way,
this might be the way the body has evolved to control pregnancy during stressful times. In the past, stress often meant famine. The body perceives this as a lack of resources. Not enough, perhaps, to sustain a pregnancy let alone a new child.