I've been on depo provera for a year and a half and do not have my period. I've had intercourse before with no problems, aside from not "having my cherry popped". I asked my ob gyn and she said it was normal as I could have broken it in other ways. Today after intercourse I noticed very light pink spotting. Is this a problem I should be concerned about or normal?

It can be common, especially if intercourse was particularly rough, or if there was not enough lubrication.