i am so sorry for your loss. normally, the answer is no, a miscarriage shouldnt directly cause a problem getting pregnant again. but it is normal for an average, healthy woman not to get pregnant for 6 months.
to be sure, get some ovulation strips, online they are very cheap. this will at least give you the correct time of ovulation, so you can make sure you are trying the right times. your cycle may be off, you may ovulate later in your cycle. if you dont get pregnant right way by having sex the day of and after the ovulation surge, i would go to the doctor after 2 months. normally, they want a mother under 35 to try for a year, but if you use ovulation strips, usually they will look for things a little sooner. if you are 35 or over, go now as 6 months of trying is enough to start looking for problems.
you got pregnant and carried your baby for 6 months, so you know you can get there again. i wouldnt think there is a problem. if something in your gut is concerning you, go now and talk to your doctor. i wish you luck and again am sorry.