tmi spotting/iud

Ok so im not sure if this is normal or not, but i was on the pill before and i switched to the iud. My last period was on the 16th and i got my iud placed in on the 19th and from there i was spotting till the 28th i had unprotexted sex and he did bust in me on the 29th (as well as the 6th and 8th of this month). On friday (10th) i got cramping and then the next morning i was spottig light pink and brown i still am spotting it now has a little bit of red and mainly brown/pink but throughout the day its not enough to even soak up a pad/tampon. I feel like its a little early for this to happen and im not sure if its just a really light period i never have periods like this its not my usual type of period and its really light i would consider it just spotting but im not really sure. But this is how it was a few days ago and it would be like that or lighter/darker ive had a tampon in and it wont even completely soak it after i would say 8-10 hours (i know long time for me to have it in i would put a new one in for the night). Im really just curious if this is nothing i should worry about considering i stopped spotting 2 weeks ago and that this is so light and the colors are just throwing me off.