need help

Had a mirena in for 2 years never had a period while on it. Had it removed September 17th got my first period the first of the month like I always had before and 4 days long just like before. My first 2 periods were regular until November 23rd I got a period for 1 1/2 days long and my December period didn't come on time I didn't start until the 17th and it ended last night. My periods don't start on time any more and aren't as long any more and seem irregular and I don't have cramping. I've been trying for a baby since my mirena removal and nothing is working. I'm worried my mirena messed up my cycle. I know some woman become can't have kids after having one in