My last period was 13th February I'm 3 days late for my next period is it still early to detect hcg level for positive pregnancy

You should be able to take a home pregnancy test now:)

It's way too early. Three days late is not even considered late. In order to get a reliable reading on a home pregnancy test, you should wait until you're at least 2 weeks late, then test using first morning urine.

Can you test now? Sure. You can test any time you want. It's just unlikely that you'll get a reliable result.

You should be able to take a home pregnancy test now:)

Of course she can take a pregnancy test now. She can take a pregnancy test any time she wants, even during her period. The question isn't whether she can, it's whether she should. The answer to that question is no. At three days late it's way too early to test.