What do you think?

I took a pregnancy test a week ago and it was a positive. A couple days later I took another and it was a negative. I wondered if I had a chemical pregnancy/early miscarriage. I did some research and it said that if you did, you would have your period except it would be heavier. I still haven't received my monthly and I'm nervous about taking another test. What do you think? I would like some advice and also your input on what may have happened.