This is Dr. David
how old are you?
often times with increased stress, increased anxiety, increased physical activity, more exercise, you can miss a period or have a very short or abbreviated period.
mild cramping can be due to ovarian cyst or uterine contractions
I'm glad you are going to see your GP doctor next Wednesday. you should get a gyn exam.
your doctor should check you for infection and do blood tests for pregnancy if you have been sexually active without pregnancy protection. sometimes blood tests can be more accurate than urine pregnancy testing.
if you have cramps, you can ask for a pelvic ultrasound scan to check for ovarian cysts as well.
most likely you will get your next period at the scheduled time
let me know if you have other questions.
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