Periods, Mums and Shaved Crotch...?

Okay, I think I just started my period. If I tell my mum she might wanna look (I know :P) but the thing is, I tried shaving down there and she's completely against it. She doesn't know I did it, but if she looks for any reason she's gonna see it. :S What do I do here? Also I didn't feel anything. No pain, no cramps, my underwear just felt sticky so I checked and boom, red/brown gunk. Sorry for the TMI :L