I used a condom and I didn't actually climax and it was during my gf fertile day. she is 5 days late for her period. we took all precautions and made sure no leaks. she always has irregular periods( 21 day range lately) since she's very underweight_(5'7:100 Ibs) It's been 2 weeks since we've done the deed. She doesn't have any symptoms other than some mild cramping. Could she be pregnant?