Now I'm a bit paranoid.
It depends when you put the ring in.
The most common side effects reported by users of NuvaRing are irritation inside your vagina or on your cervix; headache including migraine ; mood changes including depression ; the ring slipping out or causing discomfort; nausea and vomiting; vaginal discharge; weight gain; vaginal discomfort; breast pain, discomfort, or tenderness; painful.
My first kiddo was a product of the pull out method, second pregnancy ended in miscarriage was on ortho evra, and third pregnancy I was religiously charting my cycles and i should have been way ahead of my fertile window.
It is best if used within 3 days of sex and it has been 4 since your first unprotected act.
It's ok that some months are longer than others.