What do I do?!?

So I'm currently studying. I'm almost finished and I always said I would have kids once I finished my course but now I'm considering doing another course for more job opportunities when I finish this one and then have kids. I'm so clucky but I'm not sure if I have what it takes to do this second course once I have a baby. I'm 21, engaged and we own our own place we both have stable jobs and savings. I just don't know what to do!