Hi mama! At 7 weeks, 150 bpm is actually on the higher end but some doctors say it can still be within normal range, mine was around 170-180 at that stage kaya hindi ako nag-alala, pero honestly best to confirm with your OB kasi every pregnancy is different. A few of my mum friends had similar heart rates early on and everything turned out fine naman, pero mas peaceful ka talaga if you hear it directly from your doctor na okay ang baby's heart rate. When's your next checkup?