Please help! I dont know what to do

Marguerite • I`m 31 years old married to my wonderful husband Thomas. I have three sweet pups that are my everything and we just brought into the world our little rainbow baby July 7th 2018. After two loses he is our miracle.
I just went to the bathroom and have brown on my panty liner. I'm very early only 4 weeks 5 days. I had a miscarriage in September at 12 weeks. My lower back is uncomfortable but I wasn't sure it's just because I worked all day. I work at a daycare so I'm on the floor a lot and up and down bending and lifting at times. When I wipe some brown is on the paper. I don't really have anyone to talk to I lost my mom a year ago. I'm just unsure on what to do right now. Thank you in advanced for any advice .