Women and bloating

Hey Marc! I'm a 31 yo female, sitting at around 145lbs, 17% bf - after losing over 100lbs (4 years ago) and working up maintenance calories over the past 8 months from 1200cals to 2300cals. However I was wondering if this would explain how much my weight can fluctuate (easily 5-8lbs). Is this due to me eating more carbs or just training my muscles harder and lifting heavier or just a woman!!!