Would gaining weight help me to conceive?

Julie • 24 years old. baby girl 💗 Sept. 2nd 2015. baby #2 due November 23rd. PCOS. Happily married since September 6th, 2014 ❤️
I have always been thin but now that my husband and I are ttc I am wondering if my weight could affect our chances. I am 5'5'' and about 112-115lbs. Has anyone else had any luck after putting on some weight?