Me (23) and my girl friend (22) had unprotected sex on 20th and 21st february. While ejaculating I took my penis out. She had her periods on 7th of february. Now it's march 16th still her periods didn't come. But she is having all the pms (lower body pain, acne, fatigue, mild cramps, high basal temp etc). Pms started 1 week back. She usually have irregular periods. Nowadays mostly she is having periods almost 1 week late. This time its been more that 1 week. She did not have symptoms like nausea, morning sickness, spot bleeding. Is it due to her health conditions or due to pregnancy?