Off an on movement . Need help mamas

19 weeks an 5 days I feel movements off an on. Sometimes it's constant , then it stops. I have a home Doppler but currently have ran out of the jelly. So it's like I'm out of my comfort zone no movement the last couple of days just went to a check up wed.  My doctor found the heart beat on his Doppler at 143. I won't find out the sex till Friday. I'm so anxious an worked . This is my rainbow baby an can't help but freak out. So my question is , is movement then no movement normal? Help a mama out . Thank you !!