Hello, my gf is having minor breast pain on and off ever since she finished her period on the 20th of march. Her period came on 16th of March. We had genital rubbing which I have my condom on before her period came; I can't remember exactly when we did that(maybe 3 days before her period) but again she had her period on 16th of March. She is worrying about getting pregnant from this. What is the chance ? Thanks!