Light pink blood help

So I'm just shy of 7 weeks and I just have been very constipated ( sorry) so anyways I finally had a bowel movement but when I wiped there was some light pink blood and now it's more or less gone. For me this has happened before as I have issues with being constipated at times but now I'm worried cuz I'm pregnant. Should I be worried or what? Is it just cuz of the larger bowel movement. Sorry first time pregnant