i have slight irregular periods so scheduling was tricky so i relied on what my iphone app told me when i started and got it that day. i mean i had spotting that day but it wasnt my normal period flow. they say you're protected immediatly/7days of insertion if you get it the day of to the 5th day but since i didnt, i want to know when i can have sex and having the nexplanon replace condoms (not pulling out). and yes, i am aware it doesnt protect against std's/sti's.