bleeding :/

My husband and I had intercourse yesterday and immediately I had brown blood when I wiped. A little while later the blood increased some and has turned red or dark red. Now today I am still bleeding and I passed what looks like some tissue. I took a picture but I don't want to gross anyone out.  I would be 6 weeks yesterday. I am not having any cramps however? Is this normal? I have had 4 children and 1 miscarriage. That miscarriage I had terrible cramps and was in lots of pain.