Hi, I would just like to know now how much hair loss is something to be worried about?

Unclear. If you are losing an excess amount of hair (more than a few strands) and this is new, then you should see a Physician to be evaluated. You may have an endocrine disorder such as Hypothyroidism or a more benign condition such as Telogen Effluvium. Any stress, even pregnancy, can lead to hair loss and usually resolves once the stressor is removed. However, it does need to be evaluated.