Feeling overwhelmed

Im 20 years old I just had a baby in January hes 3 months now and I love him so much. I recently found out that I'm 6 weeks pregnent with another. this news is so shocking and overwhelming. It's very hard on me being sick and pregnent while taking care of an infant .when I found out I was pregnant with my son I was really excited but now I'm not feeling so loving towards the new baby .does that make me a bad mom?Also any advice for having 2 kids under 2 ?