cramping and slight spotting


Today I helped my mom clean out a ladies flower bed. I was standing pulling weeds and I kept squishing my tummy. I didn't think much about it while I was working, but once I got home my belly started to hurt. I'm 8 weeks and 5 days along. I kept going about my day and decided to sit down and nap a while. when I woke, I went to the bathroom and found a light brown discharge in my underpants and when I wiped as well. As the night has gone on, cramping has started, but just on one side and the discharge has stayed the same consistency and color. Should I be worried? I've spoken with several of my co-workers who are labor and delivery nurses and they say not to worry, but I'm so afraid I over did it and hurt my baby. please help ease my mind.