Negative test, but missed period and symptoms.

My period is almost 2 weeks late, but every test I’ve taken has been negative. But I’m having those small mild cramping on either side at random. Not as strong as period cramps. No spotting or bleeding. I haven’t had much of an appetite either. All of these symptoms I had before I found out I was pregnant with my 2 year old. We’ve been trying since September so I want to be optimistic. Has anyone had this experience before? Maybe my HcG isn’t high enough? Starting to get discouraged.