You can check your pregnancy status with a home pregnancy cycle kit after a week from your missed period date

Body pain could be due to stress, exertion, vitamin D deficiency or any other essential nutrient deficiency. Start having healthy diet and practicing routine exercises also Get you vitamin levels checked

When can I know that I am pregnant

There would be deficiency of essential vitamins and minerals. Get your self treated from a doctor. Improve your diet and lifestyle. Have a exercise routine.