I wouldn't worry too much. I started feeling sick and had the worst sore bbs when I was about 5 weeks pregnant. Those symptoms have come and gone for the past 5 weeks, and I also had period-like cramps about once a week or every other week, also had a little spotting once or twice. Nothing to worry about, it's all normal from what my doctor said and what the internet has said.
There's really no point in worrying about mc. if it's going to happen, it's going to happen no matter how much you stress over it. Just enjoy being pregnant and keep picturing that little bean growing inside you.
GL!