In tears...what's happening?

I got my BFP @ 10 dpo. The lines weren't getting too much darker but did darken a little and I even got a positive on a digital.  Earlier today I took my last frer and the line was so light. I went out and got a digital and came back not pregnant. I would be about 4 weeks 4 days right now. My doctor won't see me until July 2. Is this a chemical should I just wait for it to pass?