About to start ttc. Have had horrible first trimesters when pregnant with my other children (no vomiting but horrendous, incapacitating nausea which I know doesn't sound too bad but if you've experienced it, you know how horrific it can be). Have read that GP's are now prescribing medication (anti histamines) for this sort of thing: is this true? If so, how early do I need to have it for it to be effective? Thanks