Worried

My period should have started already but I feel nothing and I’m freaking out even though I didn’t have sex 😳. My boyfriend only fingered me twice but since it was on my fertile window I’m freaking out even though there was nothing on his hands and he even washed them! I started going to the gym this month and I’m already very thin at 100 lb so maybe that’s it? Just looking for comfort I guess please 😬