Baby movements at 20 weeks

Just turned 20 weeks now with my first baby, netong nakaraang weeks medyo nafifeel ko na po small movements ni baby, pag nakaupo or nakahiga hanggang neto lang this week nag s*x kami ni hubby, nawala po yung movements ni baby then yung tyan ko na dati medyo mabigat sa pakiramdam, now po e wala na kong masyadong pakiramdam. Normal lang po ba to?