Unintentional weight loss is a red flag which warrants further workup and evaluation to rule out underlying chronic infection, inflammation, and/or cancer. Other worrisome symptoms include fever and/or night sweats.
This article may be of benefit: https://www.aafp.org/afp/2014/0501/p718.html
I agree that you should get your weight loss issue checked out. It could be caused by anything, ranging from diabetes to hyperthyroidism to heart problems. It won't hurt to have a good work up because if the loss continues, soon, you will no longer be within a normal weight range.
Thanks for your comments everyone! I did go to my primary care dr. & he said not to worry, if it were anything serious I'd have other symptoms. But I have an appt. in April with a different dr. for a well woman exam & I'll run it by her. I appreciate everyone's comments because I don't feel like such a hypochondriac now for being concerned about the weight loss :)