My 13 year old daughter just told me she is 10 days late for her period. She is having stomach pains especially when she coughs (may have a slight cold or could be due to allergies which she takes daily meds for, Nasalcort and Levocetirizine 5mg). I don't think she could be pregnant. She says she has never had sex or anything close to it and I don't know when she could possibly have had sex as the opportunity would not be very likely and she is not that kind of girl. Her older sister also says that sex is not likely for her and they are close. Should I be worried?