i am a lil nervous because i felt lil flutters at the start of my 14th week then towards the end of the week i was feeling definate kicks (i am 15 weeks 2 days now) could they have my due date wrong or could they have missed a second baby at my 6 week ultrasound. i'm not sure whats going on but i feel something was missed at my first ultrasound & everyone keeps telling me i could be having twins by how big i am already, has anyone else had this?