I would have to agree with Frost if it is something that is causing you to worry you should bring it up to your PCM.

There are lots factors that can influence hair loss. Medication may be involved, I have known some people have hair loss as a stress reaction, others as part of autoimmune conditions and others due to lack of nutrition. All of these things are best addressed by a medical professional.

Best of luck, and I hope things work out for you