Missed m/c's do happen, not sure how common they are. I noticed you've suffered a loss in the past. What you are feeling is pretty common when you have already experienced a loss.

Symptoms can change from week to week and it doesn't necessarily mean anything if you aren't having many. My BBs have not been sore since about 6 weeks yet my pregnancy is going really well. I never had a moment of morning sickness either. I've had the odd ache or pain but some days I find hard to believe I'm pregnant (those days are less and less now that I've got a sizeable bump).

There's a monthly thread on here called pregnancy after miscarriage and loss where those of us who have experienced loss share our feelings on a day to day basis. It's a great place to be because there's always someone there who's been through it already, it's very reassuring. Come and join us.