Hi Witch:
Yes, you're probably experiencing vaginal dryness due to menopause. We all slow down a bit as we age, and sexual response is no exception. You will find that even though you're turned on, you produce less lubrication. This is where Replens comes in. It's the closest thing to our natural lubrication and is widely available at drugstores.
It's also possible that your uterus is beginning to shift just a bit with age, which can cause that sensation of a full bladder when you're on top. So don't be ridin' up there until you're very turned on.
You can also expect some break-through bleeding as your hormone levels fluctuate. This is nothing to be concerned about unless it becomes painful. You'll find that panty liners are your best friend.
Remember that just because you're getting a bit older, doesn't mean you can't still have a hot and wonderful sex life--you just need to make a few adjustments.
Here's an excellent book for you: "Menopause, Naturally: Preparing for the Second Half of Life" by Sadja Greenwood, widely available in paperback. Best of luck to you. Dr. J
It could be faint irregular bleeding that's howing up, as part of you going through menopause. Start using water-based lubricant to see if that helps (eliminates the possibility that the blood is coming from the friction of vaginal dryness). Then talk to your doctor/gynecologist just to be safe. Good luck!