How do you track your cycles after a mc?

Britney • I'm a happily married to the love of my life and I'm a 27 year old who is graduating university soon this year and is hoping to start having some beautiful babies soon! We have had one pregnancy and miscarriage at 7 weeks so far hoping for a rainbow baby
Do you just use opks? I have been bleeding off and on since then so I have no idea if or when I had my period lol how do I start tracking again so I can get pregnant? Thanks!