Did you take any antibiotics or medicine in the last month or two? I have a 14 year old daughter that was the result of when I was on birth control, I had taken an antibiotic not knowing that they cancel out your birth control. I was told by my doctor that there are certain medications that will do that. That's why I am asking about the medications that you could have been taking in the last month or so. I felt period like cramping in the beginning, but of course never got a period and after doing a test and it coming up positive thats when I went to the doctor and he said I was pregnant. He actually laughed at me when I asked him how! I was meaning cause of being on birth control pills, and he made me laugh about it cause he at first thought I was asking how do you get pregnant (the bird and bees talk)... but I was scared for nine months cause I knew I was on antibiotics in the beginning with her and on pain meds and was scared something was going to be wrong with her. I am happy to say she is a normal teen... take a pregnancy test first, whether it comes up negative or positive I would recommend a doctor appointment right away. Cysts on your ovaries can cause cramp like pains in your sides...Good luck, and please let me know what you find out!!!
Well how late are you?? if you are more than a week latr take a test. Sometimes you can miss your period due to stress and or exercise