So this is a request from ginervaweasleyrocks. She left a review on my fanfic 'Ginny Gets her Period' asking me to write one about Hermione so I recommend you read that one before this one because there is a part in this fanfic that would make more sense if you read it.
"Mrs. Weasley?" 13-year-old Hermione asked quietly as she walked into the kitchen.
"Yes?" Molly said as she turned around at the sound of a voice, noticing a pale-faced Hermione. "Hermione, dear, are you ok?
"There's b-blood on my panties." Hermione replied, obviously on the verge of tears.
"Come here, sweetheart, there's nothing to be worried about." Molly said as she set down the dishtowel she was holding and held out her open arms, indicating Hermione to give her a hug. "It just means you've started your period, it's normal." She added as she felt arms being wrapped around her abdomen, "Your mum has talked to you about getting your period right?"
"Hermione, love, can I talk to you about something important?" Olivia Granger asked as she entered her 12-year-old daughters room.
"Yeah, of course. What's up Mum?" Hermione asked as she set down the book she was reading.
"Have you heard about periods? It's something women get." Olivia replied as she took a seat next to her.
"No, I haven't. What is it?"
"Well, it's this thing girls get when their body is mature. They start to bleed for a few days each month. It means your ready to have a baby."
"How old are you when you get it?" Hermione asked, a slight red creeping up onto her cheeks.
"Well you can get it from the ages of 11 to 14, it just depends on how fast your body matures."
"What… Do you do?" Hermione asked, embarrassment evident in her voice.
"Here," Olivia said as she pulled out a pad from her pocket, "When you get yours put this on your panties."
"O-oh okay, thank you Mum." Hermione said as she looked down at her book, obviously embarrassed.
"I know that this is an embarrassing subject but I have to tell you about it sometime or another, right?" Olivia asked, trying to make the mood a bit happier.
"Yeah, I guess so." Hermione replied as she forced herself to smile.
End of Flashback
"Yeah, before school started this year." Hermione replied, thinking back to when her mum told her about having periods.
"Ok, do you need a pad, dear?" Trying to hold the tears of embarrassment back, all Hermione could do was nod her head in agreement.
"Ok, come on sweetheart. I'll show you were Ginny keeps them." Molly said as she took Hermione's hand and led her upstairs. "They're right in her." She added once she got into the bathroom and opened the cupboard under the sink.
"Ok thank you, Mrs. Weasley."
"You're welcome, dear. I would put one on and got to bed, it's getting late." Molly replied as she pulled Hermione into another big bear hug. Once Hermione pulled away and gave her a reassuring smile, Molly left the bathroom and went to bed.
I was originally gonna have 'Mione get her period at the Weasley's and Molly explain the whole process to her but because she has her own mum it wouldn't make sense.