Please read, I need suggestions

Bleeding March 19-21. It was a little lighter of a flow than a regar period. I am now a week late on my period (I don't think this was a period) My period was scheduled for March 15. I had a lot of pressure in my lower abdomen, not even cramps. Could this be inplantation bleeding? I am not sure when to test? In two weeks? I have also been feeling extremely hot these past couple days and my temperature has been 99.9-100.4. As  as running out of breath easily. A lot of food has been smelling differently than it usually does, and at night I am nausea . Does anyone have any suggestions as to what this is? And when I can test?