 [ Symptoms ] can having sex cause your period to start early  i have only had sex two times and both times my period started in the middle of intercourse my period was not scheduled to start at those times and came 1 2 weeks early when it first starts it is extremely heavy unlike my normal cycle it then regulates and continues as normal for the next few days i am concerned as to why this has now happened twice and i am fearful of it happening again any ideas on what is going on [ Disease ] hi these are signs of a kidney infection this may be secondary to renal calculi get ultrasound of abdomen to rule out other causes urine culture will help to confirm urinary tract infection thanks