Hi i had the nexplanon implant removed on 17th aug four days later i bled for 5/6 days, its now the 29th sept and no period, is this normal? neg preg

Not unusual at all: The progestins hormones in Nexplanon subdermal implants had worked by preventing you from ovulating and what you just experienced after the implant was removed is not unusual; it may take you several weeks (and up to several months) to resume normal ovulation and to have a normal regular menstrual cycle. If your pregnancy tests are negative, there is really no cause for alarm