I have this two (both hips though), but some days are unaccounatbly better than others, so maybe you will feel better tomorrow? See a physio if it doesn't improve in a day or so - there are supports you can get (although I generally find the dicomfort of wearing mine outweighs benefit...but not everyone finds that).
I am always worse when I firts stand up, and have a painful night if I do much walking during the day. Try to rest by sitting with your feet up when you can.
I suffered terribly with pregnancy one from about 26 weeks, currently 17 weeks with no 2 and dreading it's return. You can get a support belt, but I found my bump was pretty high and neat anyway... May sound stupid but try to avoid standing on one leg - put your knickers on whle sat on the edge of the bed etc. Also I found at a small amount of daily regular exercise helped. Don't walk 5 miles; but equally don't sit at a desk all day without doing a lap of the office every 2 hours. Also try to keep your knees together (?!); eg I found turning over in bed excruiating, but slightly less so, if knees were together.
It's unlikely, but you should be aware that if it's only on one side, and if it's worse on moving, it could be a DVT. The pelvic (femoral) vein is the most common place to have them in pregnancy. If there's any swelling, or it seems to get worse rather than better if you try to take it easy over the next couple of days, it might be worth getting it checked out.
I think any pain would get a bit better with painkillers, but when I had my DVT, even voltarol was not really taking the edge off it . The swelling would be in the thigh at first (you can measure and compare to the other if you're unsure) and then in the calf. I think (but am not sure) that if it were a DVT, it's so deep in that it makes no difference how you lie if that makes sense. I know when I had mine, before it was diagnosed, it was more comfortable to lie on it rather than away from it (although now it's the opposite!).
I have had painful hips throughout my pregnancy. It's made worse now that I am so big and sleeping on my side puts a lot of pressure on them.
The physio tested how strong my bum and hip muscles are and they are as weak as anything. So he gave me this excersise to strengthen them. He gave me a large wide elesticated band to put around my ankles. All I have to do is spread my legs apart as far as possible and leave them there for a while. Surprisingly it has helped strengthen those muscles and I feel a lot better.
Spk to your physio to find the cause of the pain and he or she can advise you on which is the best excersise to use. I would recommend the elastic band method though.