Don't quit yet. I found the first 12 weeks really hard, all day sickness, so tired. But 2nd trimester many women get a burst of energy. From 12 weeks til 18 weeks i felt really good (then i hurt a muscle but my energy is still way up from 1st trimester.

just hang in alittle longer, cos you might start getting your mojo back. 6 months 1/2 pay maternity leave is a great entitlement.