Ovulation day? & does this mean I am fertile?

Melissa
I believe 4/18 was when I ovulated. Anyone else? And does this mean I am fertile? 
Ever since my miscarriage (with an ex bf) in 2013 I've been feeling like I cannot get pregnant again. I was 180 when i first pregnant and now I am 220 so I think my weight may be the reason. My boyfriend and I have been trying for six months, I've been constantly getting yeast infections or uti's. Every month I'm a day later and not pregnant. I'm very discouraged 😔 when I got pregnant before it happened on the first time! Why three years later it feels like impossible, mind you my ex just had a baby a few months ago and my current bf's sister is about to have her fourth child. 
We both have no children, and desperately want our own.😞 but if there's something wrong with me I'm not going to be Able to afford a fertility specialist either.