Confused

I have been trying to have another baby for about 6 months now , lately I have been vomiting, having headaches , craving different foods , and I have been sleeping a lot ..... I took a pregnancy test 3 Times they all came back Negative.... but I’m feeling really tired and I have this nausea feeling every other day ... what is going on ... my period came on for 3 Days one time then I whipped after using the rest room the other day and spotted some blood . But no period Yet 🤷🏽‍♀️