no period 5 weeks after Mirena removal

I had my Mirena removed on feb. 26 2011.  Did not have any bleeing after removal and no problems.  I have since then had frequent urination, larger and darker areolas, dull back ache, some mild cramping to pelvic area, breats also feel fuller and heavier.  I have not had any bleeding at all since removal.  My husband and I had unprotected intercourse 2 days before removal, but since then have used a condom.  Do you think I could be pregnant or is this just my body re-regulating to not having the mirena any more?  By the way this is my second mirena removal and after the first one my periods came back the first week or so after.  Thanks for any imput!