So confused, need advice!

I missed my period last month. My period this month is suppose to start around the 26. I have taken at least 4 pregnancy test.. all negative 😭

I’ve started to notice a lot of mood swings (worse than usual), constantly tired yet cannot fall asleep or stay asleep long, lots of lower back pain, constantly between feeling like I’m going to throw up & starving, having constant hot flashes, (tmi but) my boobs are extremely swollen, my nipples look bigger than usual, they are so sensitive it hurts to touch them or wear a bra. What is wrong with me!