Amy thats crazy!! running in jeans I mean!
awesome that you had the drive to just keep going and that youve found something you like!
to stop the risk of potentialy loosing muscle with running, just make sure that you are taking in adequate calories and restoring lost glycogen stores after your jog.
make sure that your start off with walking, moving into a higher paced walk, then jog to ensure proper warm up. same for cooldown, slowly lower the pace and make sure you stretch well following the jog!