I have an appointment to get my IUD tomorrow but...

I haven't started my period yet. I scheduled the appointment so I'd be in the middle of my period and idek the last time I had sex but I'm 2 days late rn. I took plan b in november and my periods been off ever since so I'm not that worried. Besides the part where I'm getting my IUD placed without being on my period. I have light blood like almost spotting but that's it, I'm sure I'll start in a day or two, I have cramps and the usual symptoms but no full period yet.

Will this be a problem when I get my iud placed?