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On behalf of Hayley:

My last two menstrual cycles have been very short, 21 and 18 days respectively. My normal cycle is 28 days and I bleed for 5 days. The length and heaviness of my periods has remained the same. I am a bit worried that this isn't normal. Do I need to see my GP about this?

Hello
I really wouldn't worry at this stage. It's not uncommon for women to experience a hiccup in their menstrual cycles. It's a complex hormonal process involving feedback from the ovaries to the brain and simple things such as stress, etc can upset this process. It's very likely that your 'normal' menstrual pattern will resume without requiring any treatment. I'd suggest waiting a couple more months and if the irregular pattern remains you could see your GP who will probably arrange an ultrasound scan initially.
Regards