Increase chance of pregnancy

Jessica • My names Jessica. I`m 23. I have an almost 4 year old daughter, and I`m TTC baby #2. Hoping for a boy! :)
I am TTC baby #2, and was wondering if losing some weight would help my chances of getting pregnant? I am 5'2 and weight about 120 (I know that's not fat). I know exercise can help my chances. I just took a picture and I look pregnant but I'm not, anyone have any tips to help me out? I'll post the pic but please don't judge. I'm self concious already. Thank you.