Bby mengeras

Assalamualaikum nk tnye...klau bby kerap mengeras normal ke...dri jam 4 pgi smpau jam 5.20 ni....kdandungan bru 26week...risau sy....mngeras x mnentu..kdg 5minit kdg 10minit,n kdg cpat...bantu sy plis...sy x fasih lagi dlam hal ni...first time mcm ni...