Blood clots while on birth control.


I started birth control about a month ago, missed my first period for last month but then got it this month. When I went to change my tampon a long blood clot came out. It almost looked like a worm (I know, gross) I’ve never really had too many blood clots during my period over the years of not being on birth control so I wasn’t sure if I should be concerned or not. Is this normal to happen when you first get on the pill?