Still effective?

I been on Norethindrone mini pill for almost a year now. I went from no periods on Depo to regular periods on combo pills to strange periods on minipill. I can have a 3 or 4 day period 1 month and next month it comes a week early and lasts like a day and a half. I take it every night between 545 and 6. The other night me and fiance were out and I realized I didn't have my pills with me and took it at 1030...4.5 hours late. I took mine for yesterday at regular time. Is it still effective even late the other night? Either way it would be fine since We are planning on trying for a baby in 2 months after I finish my pills up. Just curious if it was still effective