Confused

My regular period for May was from May 17th-May21st but the past couple days/nights (the 27th, 28th, 29th) I’ve been continuously bleeding but not heavy bleeding but enough to fill a panty liner. Is this spotting or another period? I did just get on my method of birth control (iud) about a week ago. Just concerned if this is normal or not..? I didn’t spot at all the whole week after I got it inserted but now I am? Just wondering if this is normal or if anyone else has experienced this!