Have hot flushes, sickness and sore boobs replaced that initial glow?
That's lower backache in particular, the kind that sometimes happens before your period. It happens because hormonal changes affect your muscles, making them lax, plus the weight of your bump puts added strain on your back muscles. There are two specific types of lower backache that tend to be linked to pregnancy: lumbar pain, which you will feel over and around your spine at waist level, and posterior pelvic pain, which you feel around your bottom and on the sides or the back of your thighs.
Help yourself... by avoiding sitting or standing for long periods of time. Elevate your feet to relieve the pressure. If you have pelvic pain, be careful about how you get off the sofa and out of bed, and limit high-intensity exercise. Gentle stretching can also help, as can a hot water bottle against your back.