Should I loose weight before I try to conceive again ?

I have a 7 year old and She’s getting so big and we decided we wanted to TTC with a second. Sadly I had a very early miscarriage. I can only think it had to do with my current weight. I’m 5 4’ and weigh 195 so I’m by no means small. I work late nights full time, so fitness & nutrition is definitely a struggle for me . I also have very bad metabolism so it seems no matter how hard I try I ever lose weight,although I do try. Should I lose weight before I try to conceive again ? Or try soon because the time clocks ticking.