condom broke & he came inside me !!!!

I was having sex with my boyfriend and after he came inside me and he pulled out, we realized that the condom broke. my <a href="">period app</a> says I haven't been "fertile" in about 5 days and I'm supposed to get my period a week from tomorrow. should I wait and see if I get my period next week or get plan B???? I'm only 16 & not on birth control. what do I do please help!!!!