Aah, ini common during pregnancy sebab bladder pressure lah, at 15 weeks the uterus dah mula press down, so morning urine jadi concentrated and sometimes leceh. Tapi kalau sakit tu persistent or ada burning sensation, better mention to your doctor at next checkup just in case, okay? A few of my mum friends had similar experience and it settled as pregnancy progressed, tapi memang kena monitor.