3 dats late, but no results. Confused.

Sumin

I have a regular cycle and am now 3 days late, which never happend before. I did a test yesterday and today, but both are negative. I feel nauseous from time to time on random moments. That started around the time the implantation probably would have started. We didn't even try and are always careful. Based on the time we did 'it', the chanses are small as well. Not that I don't want to be pregnant, I would love to, but I'm going on vacation in a few days and am afraid im going to feel sick all the time in case I'm pregnant. No big deal you would think, but we are going to a country out of Europe for 3 weeks😂 did I still test to early? any advise/ tips and explanations are really welcom🙏🏻