Hopefully nobody here has experienced this discomfort, but if you have, I'd love ideas or comfort that this goes away. This is my first baby and first pregnancy that has gone past 6 weeks.
I have been having wicked tailbone pain since about 10 weeks. It seems to be worse if I stand or pace a lot. It feels like the muscles/soft tissue along one side of my tailbone and lower sacrum are tight; massage kind of feels good (but that's not my husband's area of expertise, as much as I love him, and my mother has arthritic hands so I feel bad letting her try for more than a minute).
At first it felt like it needed to be stretched, so I did some hip-opening yoga (lunges, etc)--it felt good while I was doing it, but then the next day it was MUCH worse. I had to walk up and down the stairs like a toddler. Sometimes it's bad enough that getting into and out of bed is a halting, uncomfortable ordeal, and but 1-2 days a week it's not that noticeable. I've checked online, and mostly people say "get a donut pillow if your tailbone hurts in pregnancy" but this is not that kind of pain. I can't exactly recline on my sacrum in a slumped position on a firm surface, but other than that (which no one should really do anyway, ha!) it's not sitting on it that hurts.
I know the relaxin rises early, and peaks around this time, so I've been thinking that has a lot to do with it. I get lots of sleep with a pillow between my legs, and I've been doing yoga (more gently--not actively trying to stretch that area so much). I have a massage scheduled (gift certificate from my last birthday) and I am trying to find a chiropractor who sees pregnant women. I'm not sure how comfortable a massage therapist will be rubbing on the edge of my tailbone, though, since it's just a spa type of place and that's in the underwear zone. At this point, I don't care if a stranger is rubbing there--I just want to feel better.
I had a bad injury to the area about 3.5 years ago--I was hit by a car on my bike, and my tailbone/lower sacrum slammed into my bike seat hard enough to bend the metal seat rails to a 90-degree angle. It hurt acutely, in the same way it hurts if you fall on ice and hurt that part. Then for a long time I had some sort of swelling or misplacement that caused a lot of discomfort (including elimination issues)--but that eventually eased. I've had a couple of midwives do internal exams since then, and my tailbone seems to be "in the right place." Lots of yoga and a non-sedentary life during the two years that followed, and now I'm in graduate school and forced to sit ~5 hrs/day, 3-4 days/week, and my main exercise is walking in an urban area (lots of cement sidewalk walking). But I do sit on an exercise ball or the floor at home, or just do any sedentary activities lying down to be off of it.
So as "related" as that injury sounds, I had tightness in these same muscles years ago, back before I did a lot of yoga and other exercise, so I'm not totally convinced it has to do with the injury. I worry that this pain will last until the relaxin goes away (like 3 months postpartum, so January next year?), and it's already negatively affecting my sleep (and generally wearing on my nerves, making it hard to stand in line for things, etc). My other fear is that my tailbone could actually still be at a wonky angle, and will snap off when the baby's head is born. I'm afraid to ask my midwives about it because I don't want a "past pelvic injury" in my chart--if I break my tailbone giving birth, oh well, but I'm not worried about the baby being able to come out. Also I see a practice pretty far away from home, so I'm not sure they'd be able to recommend someone close by anyway.
Someone recommended seeing an orthopedist, but I feel like they'd shrug and say "What do you want, lady, pregnancy is uncomfortable!?" I wouldn't do radiological studies, so it's not like they'd have any information other than my symptoms and their hands, and increasingly doctors just can't tell anything without expensive tests.
I realize this is bearable compared to other pregnancy discomforts, but if anyone has ideas for alleviating it, experiences similar, or suggestions for other ideas to try, I'd be grateful. What kind of professional might be able to tell me what's going on in there, and help me decide whether to stretch it more, rest it more, etc? I feel like I can't figure out what makes it better/worse. Sorry this is so long!