5 weeks pregnant

Today I am 5 weeks 4 days pregnant. For the last week I have been having done brown discharge, and the last few days there's been some pink. Not really any cramping at all. My breasts are tender. I went to the ER at 4 weeks 6 days and my hcg was 233. Two days later it was 324. They don't want to see me again for another 2 weeks, but today I'm having this. What do you think is going on?