Just curious

My first iud I had in for almost a year an my periods were very regular wasnt ever late I had it taken out an an about a year later had a baby shes now 7 months an i just had a second iud put in a little over a month ago an my period is 8 days late which i know itll take awhile for my body to adjust to it but it was never late with my first iud an its the same type of iud so im just curious if this is normal or if anyone else has had the same experience