Pregnant?

So I had a pregnancy scare last week and I took two tests(first response) and they both didn't give me results so I tried a different brand(clear blue) and it came out as negative but my period was really late and I had a lot of the common pregnancy symptoms, fast forward to today and I thought I got my period but it's way too light and (TMI) it's always a heavy flow in the beginning. I really don't know what I should do, I'm really worried and don't know what to do. Any advice?