Tmi: spotting?

Montanna • Mama of two beautiful daughters!
I'm 7w5ds and this weeked I had a very small amount of blood-tinged vaginal discharge.. It's happen twice, once this weekend and once today. I'm hoping it has to do with the fact I'm slightly constipated and both times I had to strain a little.. 
  This is my second pregnancy and I've never had this before. 
I'm just really worried! And don't know what to do!