Should I be worried

Last time I had sex was back in the beginning of February. I got my period at the end of the month and I was heavy for about two days and then I was light which isn’t normal for me. I had my period in march towards the end and my period was heavy for the first 4 days and light for the rest. And now I feel like I’m getting anxiety all of sudden. There’s no way for me to be pregnant right?