Aiyoh, I know how scary it can feel lah, my friend also had something similar around her second trimester and she said the sharp pains when walking were actually round ligament pain, which is quite common as your uterus grows and stretches. Someone in my mum WhatsApp group mentioned that cramps coming in waves then fading can sometimes be Braxton Hicks starting early, but she also said the key thing is to track whether the pain is regular and getting stronger, because that's when it becomes more concerning. Another mum I know had that bottom right twisting feeling and her gynae explained it could be ligament stretching or even gas, but she said don't anyhow assume, especially if got bleeding, fever, or the cramps don't go away, that's go-to-KKH-A&E territory, no need to wait. That said, some mummies also experienced pelvic girdle discomfort around this stage, which can feel like sharp pains with movement, so there's quite a few possible reasons honestly. Either way, since every pregnancy is different and you're already feeling a bit unsettled, best to check with your own gynae or specialist just to be sure, better peace of mind than worry, right?
Cramping and random sharp pains can be quite common around this stage of pregnancy as your uterus grows and the ligaments and muscles stretch 😊 The sharp pain when walking or changing position especially sounds a bit like round ligament pain, which many mums experience in 2nd tri. Since your pain came in waves and lasted a couple of hours, it's good that it settled on its own. Do keep an eye on it though. If the pain becomes regular, gets stronger, or is accompanied by bleeding, leaking fluid, fever, or reduced baby's movements, do contact your doctor promptly. In the meantime, staying hydrated and taking it a little easier on days when you're feeling more discomfort may help