My gf and I had protected sex on Jan 5. Full blown period came on Jan 16, right on time. Would that mean shes not pregnant. Anyways... Feb 13 she was suppose to have another period and she hasnt started yet. Could she still be pregnant? I thought a period was flushing out the egg and the lining. Wouldnt that mean a egg is not fertilized. Only help please. Just asking for opinions.