This pregnancy is so much different!

These 6 weeks have been so different than any of my other pregnancies, and I am talking losses and healthy births. Maybe because I am older, maybe because I took some kick ass fertility supplements. I never had any bleeding or spotting that didnt result in an mc, but for three days I had dark brown discharge, went to the ER and they saw a gestational sac, no embryo yet, and my hcg was 22,273 at 5 weeks 5 days. I know brown is good, it's just never happened. I have only had occasional nausea in the late afternoon or early evening, and yesterday I couldn't stand for more than 20 seconds without having to lay down because I felt so weak! Last two times I was just nauseous the whole time until about 6 months. I don't know if it worries me or relieves me that I am not having the same symptoms and I am 6 weeks 1 day.