I Had Unprotected Sex With My Gf A Day To

I had unprotected sex with my gf a day to when she saw her period and gave her postinom 2 within 12hrs after the intercourse and she saw her period the next day and after the last bleeding of her period we had Unprotected sex and 2 days later she is complaining of headache, dizziness, fatigue, stomach pain and she eats alot.. Could she be pregnant or its the side effect of the drug?