Yes, take a test. You can take it whenever you're ready, but it's probably best to wait and test first thing in the morning.

May I ask why you would want to have a baby at 17 years old to begin with?
How would you possibly be able to give a child the life they deserve with no education and no career (can't get a good career without an education)??

Aside from that:
You can test for pregnancy since you have missed your period. It should be accurate at this point.
You wouldn't be feeling pregnancy symptoms so early. The first symptom is the missed period, the other symptoms begin weeks later.