Period is late, should I panic?

My boyfriend and I last had protected sex over a month ago before the lockdown procedures took place, and I haven’t seen him or had sex with him since. I got a period immediately after (lasted just about 7 days), but now my current period is late by a few days. I’m never usually late, but I had egg-white cervical mucus two weeks ago, so I know I ovulated at some point. Why isn’t it here yet? Should I get nervous?