you and Sherlock were dating, you had been together for about 3 years , both of you equally smart (Sherlock more so) and both having good jobs. Right now you kept having mood swings and stomach aches , of course that meant Sherlock had to sit through pointless lectures to end up holding you a few minutes later but now he just began connecting dots. As he sat on the couch listening to you as you went on a rant, he tracked back your latest period and what not as he looked at you..soon the door opened as John came in, he saw the yelling so he sat down beside Sherlock to understand what was going on

John,”what did you do now mate?” he spoke in a whisper to make sure you wouldn’t get more pressed, Sherlock of course shrugged before talking Sherlock,”I don’t believe this has to do with me…she’s been cranky this whole month, hasn’t gotten her menstrual cycle yet..”As Sherlock explained his point John looked at him and finally got it and looked back at you John,”Oh.”