Unprotected sex during period and Ella

Ek

Has anyone had experience with Ella? I took it to be safe because I had unprotected sex on my period (Second to last day) (thankfully I have a regular cycle and should be in the clear) but I am overweight and worried it won’t work! The doctor said they weren’t worried about my BMI but the packaging says BMIs over 30 make it less efficient and mine is 37.