Plan b one Step :/ help

So I noticed that I've been feeling bloated gained 4 lbs and my nipples are sore, only nipples not whole boob. Not I wanna cry when i touch them but when I pinch them (tmi I know) so I check my IUD strings and realize they're way to freaking long that my IUD is absolutely not in place anymore. I had sex on Saturday night around 11 or 12. I just took plan b one step around 1 this morning. I haven't taken it before. I'm going in the morning to have my IUD checked out. If you've ever taken it did you get your period after or did it come the normal time of your cycle. Does 73 or 74 hr make a big difference.

I know its long, just freaking out a bit. Thank you ahead of time :)