Based on your LMP of 15 Apr, you’d be about 7+ weeks by 6 June. That’s actually a good time for the first scan cos heartbeat is usually visible from around 6-7 weeks onwards. So there’s a good chance you’ll see it! I totally understand the anxiety given your MMM history. If anything, 7 weeks is better than going too early at 5-6 weeks where it’s 50/50 and then you’d stress even more waiting for a repeat scan. Keep the appointment, you should be fine. Sending good vibes your way!