Urine Drug test but I’m on my period

So I’m supposed to take a urine test probably tomorrow they will do it on the spot. I have worked for the same company 6 years ago and I have a good feeling they will hire me. But... I just started my period 2 days ago. So my question is do I still pee? It’s nasty and kinda embarrassing you know gross that there will be blood and cloths in the urine... what do I do? I don’t want them to think I don’t want to take the drug test... do I say something? It will be very awkward...