Period ended 4-5 days ago - Should I take an ECP?

Not sure what to do right now. I know sex at any time carries a risk of pregnancy. However I have taken the ECP before a while back in the past and it really messed up my body, made me bleed and very sick etc so I’m stuck!!! My period ended Saturday midday and right now it’s Wednesday night. eve says my chances of pregnancy is 7%.

I had unprotected sex Monday night and he came in me. Tomorrow night would be exactly 72 hours the last chance I can take the ECP pill.

If someone can please refresh my memory and help:

how long does it take for the side effects to kick in and how long will I bleed for?

Thank you in advance! Xx