A little confused..

So, I had taken threw tests last week, the first two were BFPs, the third was a BFN. So I bought another teat earlier and had taken it, it was supposed to take 2 minutes to process, but it didn't show anything. At all. A few minutes later, it only showed one line, a horizontal line. So, just the negative line. I'm so discouraged, I threw it away and started crying. I've had absolutely no bleeding, spotting, buy a yellowish clear discharge. My period was due the 14th, and I'm bloated the size of a hippo. Aside from calling the doctor, cause I'm waiting on a call back, what else can I do? 😔