Irregular period issues?

​To make a long story short, I didn't have a period in the month of June. My first day of my last period was May 19th, and that one came a week late. But now I'm two weeks late and it's starting to worry me. I feel pretty regular, but I'm incredibly tired all the time. I was cramping lightly two days ago. I know the correct way to go about this would be to take a test, but I'm afraid that it'll be negative and I'll get my hopes up for no reason. :( I haven been able to conceive in 2 years, and I had a miscarriage 3 years ago at 11 weeks along. Infertility runs in my family, so I feel nervous.  Any advice?