Ovulation after early miscarriage

Melinda • Had 4 miscarriages in 2015 and had our rainbow baby December 2016
I had what the dr calls a chemical on the 24th of feb. They tracked my levels back to 0 (they called me on the 3rd of March with the results and gave us to ok to start again). I didn't start taking OPKs until the following week so I didn't waist them but I'm now on cycle day 16 and barley getting a line on my OPKs. Does it look like I may have ovulated sooner? Like on the 3-4th? I'm so confused. Or will I just ovulate later?