Wa'alaikumassalam! Jangan risau sangat lah, setiap orang beza, some of my mum friends had frequent urination from week 4, but ada jugak yang tak experience sampai later in pregnancy, so it's not necessarily a sign something's wrong. Frequency of urination really depends on individual body and hormone levels, bukan indication of whether baby is developing well or not. Kalau you're worried, best lah check with your doctor just for peace of mind, they can do a scan to confirm baby's development, yang tu je boleh settle your worries properly! Hopefully semua okay dengan you