15wks tomorrow and paranoid?

Ive been goin thru so much lately and been stressed i kno thats bad but sometimea it cant be helped. My next appt is tuesday...im losing wt for one thing and i keep having pain not severe in my lower stomach n im so worried about my baby it makes me sick...so im wondering of i requested to have more appts would they consider it...also is there anyway to kno if something is wrong with my baby...ugh im just a mess sorry for typos n longness...