Would greatly appreciate your opinion...

I use to be on the pill. Got off of it. Now I'm back on it. I forgot the date that I should start taking it. I couldn't remember if it was the first Sunday after my period started or ended. My period came on a Saturday. Correct me if I'm wrong, but I believe I was suppose to take my first pill the following day. But I didn't. I didn't take it the following Sunday either. I took my first pill on Tuesday night at 8:30pm. The next pill the next morning at 8:30am. And so on till I caught up to the appropriate day. So for about 2 days, I was taking 2 pills per day. I am all caught up now. My question is: Since I missed a couple of pills during the first week, when is it safe to have sex without a condom?