Hi tamrajo
The first thing I thought of was Saturn having something to do with this. And low and behold, Saturn is transiting across your Nadir currently, this is also in opposition to your MC. Saturn causes us to look at our plans and our current way of operating in the world, and make any necessary changes. The 10th house is about career, as well as motherhood. So Saturn is now asking you to look at your options, and if necessary drop anything that is not good for your progress spiritually and in the mundane world. If it is your career that is not going to serve you any longer, it is likely to end during this transit - maybe as you say, to focus on motherhood and solidify that aspect of your life.
I feel, if we follow our hearts, then we'll be guided along the path that is best for us. So fighting the feelings that Saturn may be making apparent may bring about obstacles. Saturnian blocks. But those blocks are just signposts along the path, maybe showing us to take a different route.
It also looks like there might be a change of some type maybe next year as Uranus also conjuncts the MC. You can feel this now, something inside is talking to you. As you say, your heart isn't in it. Saturn makes things tangible and solidifies things, give us firm roots from which to move forwards. Uranus shakes things up, refreshes things, it rules rebellion, independance, and doesn't like restriction of any type.
With Saturn passing your Nadir now, you are being given the time to assess your goals, the plans you have and the current structure of your Nadir and MC areas which includes home, work, motherhood and your roots or inner most self. Early next year when Uranus starts to conjunct your MC, that planet tends to speed things up, and shake things up, so you may find those same areas starting to change rapidly. Uranus gives us the energy and oppertunity to take risks that we normally wouldn't take. So if any time is a time for branching out of an routine job, that would be the time.
I am curious too as I'll have Saturn transiting my 10th house soon
NR
Edit: after reading about Saturn today, I've realisethat Saturn is where we have our fears and it can be where we feel weakest. In your 4th house, I am not sure how relevant that is to you? The Saturn return is a turning point in life, where we can face our fears, learn the lessons from the last 31 or so years, and assess which way we are going for the next 30 or so years until the next Saturn return. I am wondering if Saturn will be asking you to focus on your 4th house, your home and your inner most roots, rather than a strong career, and find strength in your 4th house areas..