Hi mi. I have a friend na unang nakita is sac, after 2 weeks nakita si embryo then after 1 or 2 weeks tyaka nagkaheart beat. Kung yung 7 weeks mo is based sa LMP, di naman yun ganun ka accurate. Pray nalang na magpakita na si baby sa next ultrasound mo. But, always be careful and dapat nagtitake kana pampakapit since nagspotting ka and bedrest.
jhoan delr