Clearblue digital vs. First response

Hello everyone! Last Thursday I got my bfp on a clearblue digital=) a few days later, I thought the battery on the digital was dying and I was bummed. It may be silly, but its nice to have that positive test, especially when it doesn't quite feel real yet and your first appointment is a ways out. So, like the crazy poas addict I am...I bought a box of first response tests and took 2 more tests. Honestly, I was disheartened to see how faint and almost nonexistent my results were. I thought once hcg was built up enough for a digital, a traditional line test would come up positive for sure. Has anyone else ever had this happen?