Pregnancy blood test

Baby

When is an ok time to take a blood test to check if pregnant or not. Currently it’s not 100% clear if I am pregnant as I am having faint/unclear lines on pregnancy tests. At this point if i was in fact pregnant would the results show from a blood test? I don’t know when my last dpo is I havint ovulated as I have pcos. I also don’t have any symptoms. Thank you.