The only time when you can conceive is during your ovulation phase. To be more precise, you can conceive if you have had intercourse with your partner somewhere around fourteen days after the first day of your last period or fourteen days before the beginning of your next period. If you didn’t had intercourse at this time a month ago, then you may not be pregnant. Taking pregnancy test however will be an easy way to determine whether you are pregnant or not.
In fact the main point here is that you are taking too much stress because of which your hormones become in balance and eventually causing complications regarding period. Stress is always bad for your health and affects your body in one way or another. Keep yourself stress free and you will notice that soon your periods become normal. Extreme change in your environment can also cause a one day period. There is nothing to worry about, it can happen occasionally.