I had the same dilemma as you. I couldn't add A&P at all, 'cause every one of them was full, even the waitlist.
However, I showed up to the first day of class. The teacher told us that there was no guarantee that we would get added, but he was going to talk to the dean. After a week of waiting, thankfully, he was able open another lab section.
Also, my classmates showed up to the first day of every A&P class open that semester, in the hopes of being added. So my advice to you would to be to show up to the first day of all A&P classes, and see if there are teachers that can add you.