6days late on my period

My boyfriend and I will have 3years in may, last year in February we decided for us to try and get pregnant. We’ve been having sex during my ovulating days he always cums inside, I even started taking prenatal vitamins I’ve taken a pregnancy test atleast 4 days before I’m due to start my period (always Negative) December 20th was the last day of my period, I’m usually 28days even or atleast 1 day late but I’m 6days late on my period now I spotted 2 days before I had to start my period 1st day was medium/light and the next was very light and I’ve been cramping here and there and I always feel very bloated after eat .. I’m just scared that it’ll come out negative but I’ve never been more than a week late and I swear I’ve been soo moody lately everything my bf does or says gets me upset and then I’m like nothing ever happened