I gave birth to DD 8 weeks ago and went to have Mirena coil fitted on Friday. This is my second coil as I already have a 5 year old son. The Dr did not mention using any additional contraception (I told her I had a period 11 days ago) and it says in the Mirena leaflet that it is effective straight away. However on further investigation I have read that it is only effective straight away if fitted within 7 days of the start of your period! My husband and I had a moment of weakness on Sunday where we did have penetration (all for a whole 30 seconds as I panicked about falling pregnant!!) but he did not ejaculate (TMI sorry!!). Please can someone reassure me that everything will be ok as I am worried sick as there is no way I want another baby!