Hi
When using a pump, bg levels will flunctuate a bit so that is the reason for bg testing fairly frequently so that you can work out whether or not you need to eat some food or do a correction.
When you got your pump in March, Spring was emerging with the start of warm weather but now Winter has come and that will mean that probably you will need more basal. If this is the case, then that will explain your high bg levels. Weight gain will also mean more insulin is required.
What to do......... try testing your bg levels every hour without eating any food to see if your basal rate is ok and is keeping you at a good target. If it isn't then adjust the hourly basal rates 1hr before the high bg level. Usually by not much though so dont overdo it. In Winter time I need to use approx 12u of basal but in Summer I only need approx 11.3u basal so you can see the fine tune.
Getting high bg levels to lower will mean a larger correction depending on how high the bg is. If very high I always use my pen and add another 1u of insulin onto the correction and then tell the pump what I have done so that the wizard tells me what Active or Insulin on Board I have but that of course is presuming that the problem is just a 'one off'. If it kept happening, I would look for a pattern and then start adjusting the basal.
Hope this helps you a bit but if it hasn't and you feel that the pump isn't working as it should... take it off and go back to insulin pens again as high bg levels that you cant address very well is not good.......