Oo normal yan, lalo na kung very early pa lang! So kung nag-positive ka ng April 20 tapos nag-TVS agad, maliit pa talaga ang gestational sac kaya minsan hindi pa nakikita clearly, kailangan usually ng 5-6 weeks para makita ng malinaw sa ultrasound, lalo na sa TVS. A few of us here had the same worry, nag-serum test positive kami pero ang ultrasound parang "wala pa," super nakakateninger talaga! Pero since you mentioned may sinabing kumakapal, siguro nag-check na ang doctor ng lining mo and that's actually a good sign, it means your body is responding to pregnancy. Definitely go back for a follow-up ultrasound in 1-2 weeks kasi by then dapat makikita na nang maayos ang pregnancy, then kahit meron mang concerns ang doctor ay makikita na agad.