I have a low voice. I have always had a low voice. However, when I got pregnant the first time, it got lower. I was told it would go back to normal after my child was born.
I can now, depending on the songleader, sing the bass part at church. I'd always been an alto, but even that can be too high for me at times. A worse problem, though, is that I started being mistaken for a man on the phone on a regular basis. I worked on my phone voice, trying to make it chipper and more "feminine". It helped, until I got a cold a few weeks ago. In the last week, I've been mistaken for a man on the phone 3-4 times.