Pressure on lower belly

So I haven't received my bfp but I do believe that I am pregnant, I am going to test in a few days. Today I Have been experiencing some pressure on the lower left side on my belly. What could this mean? I'm expecting af in 2 days. For the last week I've been extremely naseaous, gassy, so tired like usually I can run off little sleep and I'm good but now it's crucial that I get alot of sleep or else I'm falling asleep. I am also very emotional I tend to break out into tears over random things like cake, mid sex and over a movie. I could have gotten pregnant right before last month's period, when I tested I saw a vvvfl.

Please help me?!