I need some opinions.

So me and my fiancé are getting married in two months and we’re not ready for kids yet, but we had sex so good we thought, hell, one kid can’t hurt. And then regretted it 30 seconds later. (He usually pulls out, I know, I know, not reliable But it’s worked for about 2 years now lol). Anyways, my period is now 2 weeks late, and I’ve been nauseous a lot, so I took 2 tests but both came back negative? Is there a possibility that the test were wrong? Or could there be something else going on? All opinions are appreciated, thank you.