Basically, had sex with girlfriend for the first time (lost our virginity). it was around 2 1/2 weeks before her next expected period. While we were doing it, she was on top of me, and after a few minutes i came while she was still going. after i ejaculated, she still continued for about 30 seconds or so, and my penis was losing its hardness. I WAS WEARING A CONDOM. but as all of that was happening, i did notice wet stuff on the base of my penis. it wasnt like a watery feel, but more of like a slimy feeling. 

both her and I have been freaking out and stressing this past week. She says shes already 2 days late. she has normal period symptoms like tender breasts, cravings, fatigue. she has not gotten any signs of morning sickness. 

my questions are:

could sperm have gotten in her, maybe because it travelled down the condom?

what was the wet stuff on the base?

does first time sex delay her period? (even though i have pleasured her down there many many times before using my fingers) 

can she get morning sickness this early? (if she was pregnant)

why is her period late? (if she wasnt pregnant)