Copper iud check up

I go in 3 days to have my strings checked but Im bleeding heavy would they be able to still locate them and should I reschedule the appointment so I don't feel grows after words since they never give me something to help clean me up and how long does bleeding last I just got it in a month ago and been bleeding for 3 weeks straight they say its normal to bleed for 3 months but if that is the case then I want it out i hate periods I did have implant before this one and bleed for 6 months straight and had it removed cause I hated the every day period any advice ladies