Sex/ period

Okay so my boyfriend n I wanted to have sex but we didn’t have a condom.... when we were making out n stuff he put it in for 3 seconds n pulled out. He didn’t finished obviously. I’m suppose to get my period this month and I haven’t gotten it yet but he’s worried cause of precum, the month of June was the last month I took birth control because we broke up but got back together. I didn’t want to start a new pack in the middle of July because my period would b off so I told him after I get my period I start it again. But I didn’t get my period... should I be worried? What should I do? I only have a week until July is over. .... OH yeah and my June period, it was really short like three days when my period is usually about a week long. HELP please please please

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