How long before I see improvement?

So I've been on birth control (FOR ACNE) and I've gained some weight, I have to be on it for 6-8 more months and I want to lose 10-15 pounds, here's my routine:
Monday and Wednesday - swimming for 1 hour
Tuesday, Thursday, Sunday & Saturday - walking for 1 hour and HIIT for 20-30 mins
Friday - rest
I eat pretty healthy with the exception of a little bit of sugar (like dark chocolate covered acai berries)
I'm 5'2, 115 pounds? (I'm not sure)

I just want to know when I'm going to see progress in losing weight and toning up, also is this an effective routine? Thanks so much!

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Recommended Answer:
Sounds gooddd!!!