I had sex on January 18 now it’s febuary 16 and I missed my period I used a condom and he ejaculated it slipped but not all the way he held it down but after he took it out I smelled like his ejaculation I took a pregnancy test and it’s negative I have regular periods I’m nauseous but I usually feel nauseous before period and ovulation and I my chest hurts randomly idk could I be pregnant or I’m just stressing.