i too am so exhausted when carrying boys!! first DS i just couldnt get out of bed,thankfully he was my first born as i wouldnt have been able to look after another child,,then fell pregnant with DD and felt fine,no sore boobs,no tiredness (well none compared to with my DS),,DS2 (sadly born sleeping at 20weeks) i just knew was a boy as i felt exact same as i did with DS1,,this pregnancy i have again felt fine,,just like with my DD,,but will find out next week sex of baby,,hope you hear blue at your next scan, when do you find out?