It is a big responsibility, except it and take car if it's true.
I was 20 and a single mom-remember it's forever. Can honestly say that I wish I would have waited till my 0' would have been more mature.
i was pregnant at 16 myself...this is a very pivotal time in your life. i hope you are able to reach out and get the support you need.
Get a test and talk it over with your mother as soon as possible. The sooner you get this sorted, the greater your options.