Symptoms

I've been having headaches, nausea (severe), dizziness, sore swollen breasts, cramps (left and right) and I haven't been able to sleep on my stomach which is how I normally sleep for a couple of weeks now. I looked it up online and all that came up was pregnant but I have taken 2 tests and they both came back negative. Me and my boyfriend have been trying for a couple of months now but nothing... What do I do? We really want to have a baby☺️