getting back at it

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Ok so life got in my way big time i was down to my 1st goal of 145 then we went on a cruise and a month later the 10 pounds i had lost have turned in to only 4 pounds. when we got back i had birthday parties, potty training my now 3 year old, Easter and all that goes with hosting Easter/birthday party. Its time i get back to the gym but i am so disappointed in myself that i gained the weight back. I felt sexy, happy, pretty even and i let it slide away and now my husband and i are trying to get pregnant and i wanted to be at my goal weight of 135 by the time that happened most importantly i wanted to be at a healthy weight when we got pregnant again...i need help motivation to get me back on track and and loosing weight again....thanks