Why in the mornings does my pubic bones ache?

Pelvic girdle stress: 32 y female with "pubic bones ache in morning". No other info given. Assuming this is long-term & not related to infection, it might be the case that her pelvic girdle harbors loose joints related to Hypermobility Syndrome &/or injury, & a loose sacroiliac joint; ligaments of which are stressed/pained as bony pelvic girdle ring is torqued by ground forces of sleep surface. See an Osteopath.

Inflammation: Varies, some patients will get inflammation in their symphysis pubis that can be worse in the morning, other possibilities as well. Don't hesitate to be seen for it.