Symptoms

I have been extremely sleepy and moody. I had unprotected sex on December 12th and my period is not until December 31st. But I have never felt this tired everyday and became this bipolar. What's up with me? Should I take a test? Why do I feel sad? Is it because the man who I conceived with and I are no longer together? However we have a bond where he will understand be there for the both of us. I just don't know if I am.