Lifestyle Factors
Another reason a woman can get a negative pregnancy test and not have her period is her lifestyle. One example is stress. It can get to the point where it delays your period. Another thing that can affect it is malnutrition. Drinking too much caffeine can have a damaging effect on a menstrual cycle as well. Not to mention, sudden lifestyle changes like intense exercise or working overnight shifts can cause a period to be irregular.
Lifestyle Factors
Medications
There are medications that can tamper with your period and cause worry. Of course, birth control is one of them. However, other medications can lead to a missed period as well. For example, blood pressure medicine or allergy medications can throw off a woman’s cycle and affect her hormones. Pay closer attention when you start taking medication so you know what to be aware of down the line.
Medications