How do I know my period is coming?
You can remember the date and look for PMS symptoms like mood changes, abdominalcramps, fatigue, nausea, breast tenderness etc
Its unlikely to get pregnant in these days but depends upon when you ovulate
You may experience early signs of pregnancy like tender breasts, nausea, fatigue and sensitivity to smell or bloating about a week-and-a-half before your period is scheduled to arrive due to hormonal variations.
It could be a Premenstrual symptom or implantation cramps or there might be other causes like dehydration, strenuous exercise or lack of muscle use.