How often should I take a pregnancy test?

My husband and I have been trying for a little over three weeks now. We took our first test today, and it was negative. We are a little surprised since it was easy to conceive my first child, but we are not discouraged whatsoever. We get busy at least twice every single day. (We are REALLY trying! Lol!) How often should I test? Also, we use EPT Early Detection Digital. I want to be able to get a cute picture of us with the test that clearly says "PREGNANT" when that time is here. ;) Is there another test that may be more accurate? Thank you in advance for your time and advice!