my girlfriend and I lost our virgin to each other on 23rd November. Her last period was 13 November and it lasted only 3 days. We had protected sex and was sure that the condom did not break as we saw the cum still inside the condom after we were done. However, until now, she still has not gotten her period for this month. I assume its alrdy 5 days late since it's already 18th December. We're really worried that she might be pregnant, any advices? thanks in advance