What's wrong with me?

Just looking for advice not a diagnosis. Currently waiting for the gp to call me back.

Right, I am feeling drowsy, sick/nauseous. I feel like I got tummy pains and I feel so weird right now. I am having pregnancy symptoms but I can't be pregnant. My boyfriend had Pre cum last time we had sex and I then came on my period 2 days after that. Not a possibility!

Why else could I be feeling like this? Every morning and night I feel sick!!! I feel like I'm not with it at all.