I had a d&c 11 days ago, i was wondering if it's safe to start trying right away before first period? also, when should i expect to ovulate? thanks

I would wait: To give your body a rest and go through at least once cycle. 10-14 days after your cycle, you should be ovulating again. I would also recommend testing (and treating if +) for mthfr genotypes, people who have this should not use regular folic acid, they need l-methylfolate to be able to cross the blood brain barrier and make important neurotransmitters and a healthy baby nervous system.