lost virginity & period

I lost my virginity a little over a week ago and had sex 5 times including the first time. We have used a condom every time AND he has pulled out. I'm not suppose to get my period until April 14th, but a lot of people said when they lost their virginity that their period was late. So I just wanted to know if I should be prepared for my period late? and if it is, not to freak out because that's normal right? And at point should I start worrying ?