Thanks for your question, and I recommend you discuss your concern with your doctor
. When a person is sexually active, there is always a chance that a woman can become pregnant. As you are noting, the menstrual cycle is not a perfect indicator of fertility, and the cycle can vary widely both between different people and from month to month. For that reason, if you are trying to prevent pregnancy, please use some method of birth control
. It is also appropriate for me to recommend safe sex practices, including protective barriers.
Now, it is very clear that changes in emotions, stress levels, diet, exercise, etc can all have a profound effect on the normal variations of the menstrual cycle. In addition to all of these, the age of the woman in question can also lead to some variations, as cycles will often become erratic as a woman enters menopause. As you do not provide your age, this is difficult to comment on, although women entering their 40s (with wide variation, of course) should generally consider this. Additionally, it is important to note that not all vaginal bleeding
is necessarily from menstruation. An irregular cycle such as you describe should be discussed with your physician. Again, please speak with your doctor.