Sayang, I understand you're scared, but please la go see your doctor or midwife soon, pain during buang air kecil, lower back pain, and leg cramps together at 5 months needs checking out, okay? It could be nothing serious, tapi better safe than sorry, especially first baby. A few of us mums had similar worries and regretted not going earlier when things could've been handled faster. Don't worry, clinic visits are routine and they're used to pregnancy questions, you won't be the first!