Uy, 4 months na pala! Right side pain during pregnancy is quite common kasi lumalaki ang baby at may pressure sa organs, pero dahil wala ka pang OB visit, mas okay kung ipacheck mo na talaga with a doctor para sure lang, hindi ka makakatulog ng mahimbing pag nag-aalala ka, right? A few of us had similar aches and it turned out normal pregnancy stuff, but some cases do need checking so walang what-ifs, lalo na first trimester pa yan in terms of monitoring. Kaya go see your doc kapag available na, and in the meantime take it easy, rest when you can, at let us know how it goes!