Boobs aren't big and sore anymore. Should I be worried?

Corrine
Hate to even post this, but I'm a little stressed. I'm 8w4d and I noticed yesterday that my boobs don't seem to be as big as they were and they're not as sore either. I had a miscarriage last year, so it's hard not to wonder if everything's ok. I did go to the doctor at 7w0d and I saw/heard the heartbeat, but my next appt isn't for another 10 days. Should I be worried? Has anyone else experienced this?