i was late chaging it a couple times and started bleeding a lil and i didnt have sex then but i am a not skinny and i know its less effective the more you weigh and i was supposed to change it tue and took it off to have a periob but changed my mind cuz the holidays. and i didnt bleed at all and i put it back on and later i started feeling sick. so what i am asking is if i was pregnant would putting the patch on make me feel sick and have headachs and tiredness?