Are you using a scale that includes body fat at home?
From past experience... I have a bad habit of weighing everyday and have seen body fat and body weight jump crazy amounts from day to day on the SAME scale. I have even seen this happen in one day. Honestly, do not put too much trust into these tools as they are highly inaccurate.
What I suggest is waiting several days and reweighing and seeing if anything has changed.
If you def. think you are gaining then look closely at your diet. Are you writing down every nibble? I have discovered through fitday that my little nibbles and bites here and there really add up. For instance, I had some milk in my coffee a little cheese, some bites of dark chocolate while making dinner and then a couple of cherries and sweet potatoe fries from my boyfriends plate. I would do this day in and day out, thinking for the large part I was eating pretty well. BUT in reality I was eating an extra 300-500 calories a day by NIBBLES alone! Yikes! I've also found that a lot of times what I think isn't much food is actually a lot more calories than I thought, esp. since using a food scale to make sure I was eating what I thought.
And another sucky part about being a woman is that losing weight is tough stuff! I had to drop my carbs down to 10% of my macros to get through a plateau. Its all about finding what works best for your body individually though. Hope this helps and best of luck reaching your goals.