6 weeks pregnant

Hello everyone quick question, 
I know I'm probably being way paranoid but I'm 6 weeks pregnant I will 7 weeks this coming Tuesday. This is my first pregnancy 
This afternoon I started spotting, it's not a lot just enough to notice, my husband and I did have sex last night! Is this normal for a little bleeding to occur?? I'm not cramping and I don't feel bad at all just wondering any advice would be wonderful!!!!?