Late late late!

So, as of today my period is 12 days late. At day 7 I took a pregnancy test and came back negative and then my husband begged me to take another the day after, negative again. The first 7 days I was nauseous after everything I ate but a couple days ago I didn't have anymore problems. My breasts are sore and like super super soft and squishy compared to how they normally are. I'm confused and trying to not over think the situation and stress about it..