Help with pregnancy test!!!

So on Monday I took 2 test(ept) and both came out light positive. Tuesday I went to my nearest clinic to test again just to make sure and I also had a very light but positive test. I bought a rite aid brand test yesterday Thursday and checked again and all test came out negative. I'm so nervous can the test be a bad batch? Has this happened to anyone? At the clinic they scheduled me a obgyn appt so they can draw blood for test. I have all the symptoms but these test are scaring me.