Try to have a baby but not pregnant, though I have been feeling some weird things.

Well I've gotten some advice that it's least likely that I'm pregnant but I've been feeling kinda off, like my left breast is sore, I've had a pinching sensation in my belly button, peeing a lot, tiredness, I've been sleeping earlier, sometimes in the morning I'll feel nauseated and when I'm eating I'll get kinda nauseous. Also I have some insomnia. What does all this mean??