Getting pregnant. Pregnancy be safe?

Hello dr please answer to my questions.. One of my friend dropped a pregnancy at 6 the week by herself by taking mifty kit as prescribed by doctor. Then she regret for her decision and decided to get pregnant again. She had one periods after abortion and then again she got pregnant but after 6 weeks she had a misscarriage. She is very upset. 1. When can she try to get pregnant again. And she needs to know the reason for her misscarriage.. 2.Is this because of taking mifty kit?? 3. How many months she needs to give gap now? For the second time she had taken folic acid still it got misscarriage , what could be the reason? Please help her. Now she is thinking like she had a misscarriage as she dropped her pregnancy before.. is this for that? 4.Will next pregnancy be safe??