7 days late after vacation

Hi everyone! My Husband and I are TTC for over 2 years.. Recently we went on a vacation to Cancun and we had a lot of sex but not peaking at all according to glow..I was suppose to start my period right after we got back but now I'm 7 days late. I took a pregnancy test last saturday when I was suppose to start my period and it came out negative. I don't feel any early pregnancy symptoms but I am eating a lot. Is this common? I'm thinking to take another test tomorrow morning..