The majority of miscarriages occur in the first trimester so yes it can.
No it can not.
yes you can get pregnant after a miscarriage .. i had once miscarriage now i have 4 beautiful children having a miscarriage has no effect on future fertility. Most women who have had 1 miscarriage go on to have a full term pregnancy.
A miscarriage at 1 month will probably pass itself, and you will barely notice it (whether you even knew you were pregnant when it happened is also unlikely). If you were, or think you were, pregnant and are concerned with having had a miscarriage, you should visit your doctor. They can confirm whether or not you are or were pregnant and possibly whether the embryo is still there.
Beyonce had 1 miscarriage before her pregnancy with Blue Ivy
The most common symptom of a miscarriage is bleeding; bleeding during pregnancy may be referred to as a threatened abortion. Of women who seek clinical treatment for bleeding during pregnancy, about half will go on to have a miscarriage. Symptoms other than bleeding are not statistically related to miscarriage.1 Miscarriage may also be detected during an ultrasound exam, or through serial human chorionic gonadotropin (HCG) testing. Women pregnant from ART methods, and women with a history of miscarriage, may be monitored closely and so detect a miscarriage sooner than women without such monitoring.11. http://en.wikipedia.org/wiki/Miscarriage
In two healthy people, the chance of pregnancy after having regular unprotected sex for a month is high.
Can not find anything that would indicate that they can cause a miscarriage. The safest ones to use during pregnancy is Loratadine or Chlorphenamine. If you can not take those your doctor might give you Cetirizine. Seems like you had a miscarriage because the zygote was not viable. Happens in about a third of all pregnancies.
A pregnancy after a miscarriage is still possible. As long as the embro or fetus has been complete removed from the uterus. I am one of the many enjoying a pregnancy after feeling the hard grief of a miscarriage.
Miscarriage
If you are talking a natural miscarriage that usually occurs in the first trimester it usually happens because there's something wrong with the fetus. If you are talking about abortion you have to go to a clinic.
If you had a miscarriage in the first trimester, which is most common, it's usually something wrong with the fetus and Mother Nature stop the pregnancy because it is not viable. 1/3 pregnancies end in miscarriage so it's very common. Just try again.
From what I understand most miscarriages happen prior to entering your second trimester. Miscarriages are somewhat common, many doctors stating 1 out of 5 pregnancies end up in a miscarriage. It is usually not due to anything you did but natures way of ending something that wasn't meant to be. Also, remember that many of these the pregnant women don't even realize they had a miscarriage and mistake it for their normal monthly period. I had a miscarriage at 4 weeks and my doctor told me it was not uncommon and that a previous miscarriage will not make me more likely to miscarry again. Be positive and good luck.