I think im possibly pregnant?

I keep thinking I am pregnant due to the symptoms I am having throughout the past few weeks. At first I had been, as my partner says, acting different. More moody and not myself which I can slightly see myself. I cannot say I have been having cravings but there are times I see food or think of food that makes me nauseas. Other times I am in the mood for something sweet or something salty but it feels normal. Though at the same time I have felt nauseas a lot. On and off I get a wave of it out of no where. I also have been having on and off headaches that are at random spots in my head and sometimes at the temples. A few days ago my breast had started to feel more heavy and I had felt some pain in them. In the mirror I look bloated and I feel fatter. I had stopped taking my pills in late December and I am wondering if anyone else has had these symptoms? I also feel tired and have back pains off and on. I had took two pregnancy tests throughout the last two weeks. Both were negative. It is almost as if my whole body feels awkward. I don't know if I am taking them to early and should wait till my next period to see. Anyone else having this?