What Causes Tender Breasts And Acne While On Dianette Pills?

I have been on the Dianette pill for 7 months for my skin. I finished the last pack on Sunday 9th January, and the 7-days free started on Monday 10th. I decided, as I wasn't taking it for contraceptive purposes then, to end the 7-days free early, and started the next packet on Friday 14th. However, I completely forgot on the Saturday and just took the next one on Sunday. That Sunday night I was out and ended up having unprotected sex, and yes, I know it was stupid. On Monday following that I realised and took the pill from Saturday and Monday's one together. I was wondering if I was still covered because it was technically still in the 7-days free period, or would taking the pill on the Friday and Sunday have changed that? I understand that missing pill can compromise protection, but I wouldn't have taken the pills then anyway had I decided not to stop the 7-days early. I took the morning after pill anyway, just in case, according to the instructions. That was Tuesday 18th January. For three days now I've had slightly tender breasts and acne, though I realise the latter is a side effect of having a large dose of hormones. Is this reaction normal after over a week?