Late period lol think I should know

Okay.. I've had two babies already.. my son turned 4 in June and my daughter will be 1 in july... Now my question cause. I've never taken a real at home pregnancy test to find out I'm pregnant.. I've always been told in the hospital while having other issues go on.

So.. when do I take it?? We had unprotected sex June 16th.. my period was supposed to start the 21st.. still no period. I haven't had a real period since May 1st-5th then had a second Minnie period may 22-25..

But.. still nothing for June:( so.. help. Lol