plan B question

Okay so this morning me and my guy friend went for two rounds with condoms but he did go raw for a lil bit before he put on the condom the first and then took off the cod om early the second time but he didn't cum in me I went to go buy the pill and took it anyways just in case because he said he might have had some precum in me but I've never taken the pill before so what should I expect or do?