There are certainly things you can do for it and your doctor should be listening to your concerns. Make sure you tell him how bad it was, and stress that this has been an ongoing issue and that you could be pregnant for another 5 weeks yet. If he isn't going to help you with it, you would like a referral to someone that will.
And yes, while it likely just has to do with where the baby is and how your body is handling pregnancy, that doesn't mean there is nothing you can do for it. There are exercises/stretches, you could see a chiropractor, etc.
Last time I complained of pelvic pain and kept getting told, "it won't go away until you have the baby, there's nothing you can do" and towards the end it was so bad I could barely walk. Well, turns out I had SPD and there WAS things I could have done like exercises/stretches, chiropractic care, even visited a physical therapist to try to improve things, but I didn't know that at the time because my stupid practice just kept telling me it was normal and I had to wait for baby, so I did.
This time around I'm with a MUCH better practice and as soon as I explained to them what had happened last time and that I could feel the pain creeping back in again they had several recommendations for me. I ended up meeting with a chiropractor recommended by them and it was one of the best decisions I've made. Being adjusted weekly has made a HUGE difference in my comfort levels. I kind of hate my old practice for just dismissing me and making me suffer AND it also impacted the pain I felt in labor ::stabbity::