Please tell me what is meant by pre-ovulation and post ovulation? How can I know that I am pregnant? What were the first signs of pregnancy? 3 months back my periods has been stopped and I suffered from stomach pain for 5 days. In those 5 days I observed symptoms like headache, nausea, vomiting, I can not bend, unable to hold pot as if I am carrying a heavy weight in stomach. But after 5 days my periods came. What was the reason for that. From that day my periods became regular. What was the reason that why I have suffer 5 days after period stops.