Aww, totoo yan mamsh, sobrang uncomfortable ang ubo at sipon habang pregnant, lalo na pag may kasamang nausea! A few of us sa mum group namin had that din around second trimester, at ang best talaga ay dumami kami ng tubig, honey (yung pure lang), at plenty of rest, some of my friends swear by gargling with salt water din para sa throat. But since you're already nauseous at 18 weeks, talaga dapat consult mo agad ang OB mo para makasiguro na safe ang gamot na ibibigay, especially kasi pregnant ka pa lang at gusto mo talaga ng peace of mind.