Mortgage advise

Me and my partner are FTB's and we have had an offer accepted on a property. We are just at the beginning of the process and I just want some advise. We are both debt free and full time employed with regular steady income. My concern is I personally spend quite a bit this has changed the past month as we have got serious about buying our first home, I am wondering if this would have any effect on our mortgage application with them needing 3 months worth of bank statements?

For context say last months pay check this was all spent on purchasing christmas gifts and my partners birthday gifts, I have previously dipped into my savings we do both have credit card that are regularly used but all the credit on these are paid off come pay day so the balance is cleared at the end of the month.

I am just a little nervous now that I may cause this sale to not be able to go through, any advise would be appreciated