What STI causes a second period in a little under 2 weeks?

There is nothing that can cause you to get another period 2 weeks after your last one. Why? Because a period has only ONE cause. read more

1) Many things cause prolonged menstrual periods; STDs usually do not.(Chlamydia and gonorrhea can cause spotting between periods, and occasionally heavier bleeding--but simple prolongation of menstruation is not usually an STD symptom. read more

Sexually transmitted infections may cause bleeding in between periods. However, the bleeding is usually lighter than a period. When your period comes early, take note of how heavy the flow is in comparison to your other periods. You may have to wait a day or two. read more