week overdue, negative tests

Hey ladies!
Half a year ago I gave birth to our daughter. I went back on the pill at first, but stopped after a few months to get my normal cycle back. After stopping, the first cycle was exactly as it should be: ovulation after two weeks and then my period after two weeks. For this cycle (the second one after stopping the pill), I'm not sure exactly when I ovulated, and I'm already a week late.. I've taken a few tests, but they all show negative. Could I still be pregnant? I've been feeling cramps and occasional stomach pain for about a week and a half now, and I think my period is coming, but it never does. I also have a bit more discharge than usual, but no red or brown.. Sometimes I feel a bit dizzy and have low blood sugar. I had those cramps too before I tested positive during my previous pregnancy, but then the test turned positive very quickly. Maybe I should just wait for my period to come, but I'm so curious.. Has anyone here experienced this?