4 weeks 4 days prego. 1st date of last menst. Cycle 2/28. Progesterone levels 8.47 and hCG 377. Conceived 3/11, 12 or 13. Normal or way too low?

Normal. There is a lot of variability. See if you can help your breathing by avoiding inflammatory bacteria in GI tract by avoiding dairy, grains except quinoa, sugar and processed foods. Eat lots of vegetables and high quality unprocessed proteins. Check 25-oh vitamin d level and take sufficient amounts to be in the 50-70nm/l range.