Paranoid by using fetal doppler

Hi mga mommies, Is anyone using fetal doppler at home sa inyu mies? At 14 weeks during my prenatal visit , pinarinig ng OB ko ang Heartbeat ng baby namin. Then we decided ng partner ko to buy fetal doppler para ma test namin at home, at nag ask din ako ng permission sa OB ko if it is safe to use it at home at sabi nya Safe daw & anytime pwede daw ito gamitin. But na paranoid ako kasi I am at my 16 weeks now then ginamit ko but wala ako marinig, then 2nd time ginamit namin ng partner ko but di namin mahanap yung HB ni baby. Di ko lng sinabi sa partner ko but part of me is parang nag ooverthink at napa paranoid ftm pregnant po ako. Or di lang kami marunong gumamit nito? #FETALDOPPLER#BabaeAko #16weeks#ftmpregnant