Negative tests

Summer

I have not had a period this whole month now and I have taken about 4 tests and they all came out negative. I have moments where I feel a little sick but then it goes away and this just happens through out the day. We are trying to have a baby, but not sure what to think about this. Could I be pregnant? Should I make a doctor appointment already? Or should I wait maybe one more week? I don’t know what to do.