Please could someone help, so confused with how far pregnant I am?

6 weeks from conception is considered 8 weeks pregnant. They go by the first day of your last period, so that's what you should tell people. Your previous baby probably stopped growing 8 weeks from your LMP, so you've already ped that hurdle! I know what it's like, I was a wreck until I hit 12 weeks, because I lost my last one at 11 weeks. Congratulations!