Wa'alaikumassalam sis! Hmm 72 days is quite long for lochia still, especially since you didn't tear, a few of us mums experienced bleeding that stretched longer than expected, but the lower abdominal pain when you walk or stand is something you should check with your doctor about to make sure everything's healing properly, could be anything from inflammation to uterine stuff that needs looking at. Don't worry yourself too much, but it's better to get it sorted sebab you want to be back to normal kan! How are you managing otherwise, have you had a chance to see your gynae recently?