The color of the line is insignificant. Pregnancy tests can only tell you if you are pregnant. The darkness of the line is no indication of how pregnant you are or how far along you are. You can use the brand tests, even from the same box and get a lighter or darker line any time.
The phantom calls that you have recieved, also known as ghost calls is usually caused by either a poor quality phone line, aka has a high amount of noise or foreign battery due to the line or your on an older copper line.
Use a small flathead screwdriver to remove the button cover and expose the circuit board. Dry the interior of the push button with a paper towel. Any moisture inside the doorbell button could cause ghost chiming. Verify that the security codes on the push button and wireless doorbell match.