Paranoid😥

So my boyfriend I had sex for the first time 3 days ago. About an hour afterwards I felt a little queazy. And I've been getting that feeling randomly throughout the day every day since.. And he teased that maybe it was morning sickness and I freaked out! I have an IUD and he used a condom and he pulled out. It seems very unlikely but I am just curious if anyone else got this nauseous feeling before and if I'm just being paranoid... I should be getting my period in the next day or two so I'm kinda stressing myself out til then. 😒