Depo Shot

Ok so I have a question for you guys.. I got my first shot about a little over 2 weeks ago and had unprotected sex maybe 3 days after, but he came on my stomach and I made sure to cover it.. anyways fast forward to this week I was supposed to get my period yesterday and I’m usually super regular but they told me the shot makes it VERY irregular or stops bleeding all together, is that normal? Should I panic? Should I wait? Help!!