To Each Their Own

I am currently studying for my certification test, which will be taken the end of June. I spend a vast majority of the weekend reading study guides and weeknights reading assessments. I am lucky to have worked in this area for a few years, so there's alot I do know, and ALL of this information is valuable for me. I am also taking an online course to fill the requirements to enter my master's degree program.
All of these will be completed by August 11th. I stop working 2 weeks before deliever and don't go back til December. In January I start my master's program, only one class, but nonetheless I start. My baby will be 4 months then. When I discussed my future plans with my friend at work, she said "How can you do all that?" I looked at her puzzled.
For I worked a full time job, a part time job, lived on my own 100% and took 18 credits in college, I still had plenty of free time to party. She only went to school full time and was flustered still. I am going to be a twentysomething mommy, she is in her late thirties/ early forties and is considering motherhood, but says that it will be too much work, her husband would depend on her to do too much and she isn't where she wants to be in her career. She says maybe in 2 years or so, but probably not cuz it's too much work.
I started wondering am I biting off too much? Working full-time, being a full-time mom and taking one master course? No way.... you want to know why? Because determination = results. If a million people did it before me, a million people will do it after me. If I believe it, it can be done.
Now back to researching programs =)