Trying to conceive after a miscarriage.

My husband and I have 4 children. We got pregnant and lost the baby at about 8 weeks, about 7 months later we got pregnant again and this time we made it to 14 1/2 weeks. We had an ultrasound and everything was fine and then 2 days later we lost our baby girl. I opted for a DNC because the baby had been dead inside me for a week and a half and there was no signs of the baby passing. It has been 5 months and I am having a hard time getting pregnant again. Any ideas ladies? We track my period and ovulation.