be a size 8

well in america i fink im a 6 an uk 3 or sumfink like dat, but my main probblem is my thighs yer WOW im a size 8 but wid my legs it looks like a 12 again. i used to b a 12 till i started eatin like once every 3days an yer it worked but now im startin to fit into my 10 jeans (this is autralian size by da way) thy used 2 fall down but i guess now since i fink i mite b pregnant thanks to my ex its kinda scarin me an im startin to not eat again coz i dnt want to end up like my mum an my big sister thy hav HUGE hips an NO bums it freaks me out. but i fink im guna wake up tomoro at prob 6:30 an go 4 a run, an i dnt like ranning coz of sumfink wrong wid my heart iv always had it since i was a lil girl.