A lil paranoid..

Hello mommies im a first time mom currently on my 18 weeks & 5 days today.. Now i felt my baby kicks for the firts 3 days but 2 days had passed already and havent feel him/her anymore, also i find it hard to hear his hearbeat sometimes too it take a while for me to find it unlike before i was wondering if this is normal coz i freaked out alot.. Thanks