Currently the national minimum wage for people under the age of 18 is �3.00 per hour, which for your 38 hours per week is �114.00 per week (bl**dy awful).
However when you reach 18 your salary should go up to the minimum wage of �4.25 per hour �161.50 per week.
Most Companies pay above the minimum wage, so I'd keep an eye out for a new job, its now illegal to discriminate against you because you are pregnant women, but thats not to say it dosent happen.
Good Luck