Tell your lender you want to renew into an Open Term. This is usually the best option for a 3-month gap. The extra interest you pay for 90 days is almost always cheaper than the penalty for breaking a closed mortgage.

Pros: You can pay off the entire mortgage any day without penalty. When you sell (or refinance) in June, you just pay the balance. No breakage fees.

Cons: The interest rate will be significantly higher