Advice on TTC

I'm hoping to get some advice on different things you guys tried that lead to a bfp. Here's my story in case anyone can relate! (Sorry if it's long) I was on low dose bc pills for about 5 years and stopped taking them Oct 2015. Found out I was pregnant Nov 2015 but sadly miscarried Jan 2016 and had to have a d&c. We were heartbroken. We've been trying ever since (dr said no need to wait a cycle) but have had no luck. I bought opks because I expected my cycle may be a little messed up after the d&c but nope. My periods and ovulation are spot on every month. Ive continued taking prenatal vitamins and we started using preseed last month. Still no luck. I can't help but think there is something wrong since it happened so quickly the first time and now nothing. Is there anything else we can do?