TTC after IUD

Amanda
I'm new to this app and recently began ttc. I'm 31 and have been on birth control since 16. Always on the pill until two years ago I got the mirena IUD. I had the IUD removed on 11/30/16. I never had AF on the IUD (2 yrs and 2mths). Since removal I spotted very lightly on 12/2 and 12/24 for two days each time.  I used an OPK and had an LH surge on 12/10-11, I have still yet to have AF.  I had a BFNP on 12/30. Anyone experienced not getting AF after removed?
I am taking Prenatal, can/should I take my multi-vitamin at the same time?  I just don't feel like the prenatal helps my energy levels like the multi does.