Forgetting to make sajda-e-sahw

Q: I forgot to perform sajdah sahw which was wajib upon me during the first 4 rakats of sunnah namaz. Then I started Fardh namaz and once I finished fardh namaz I realised that I forgot to perform sajdah sahw for sunnat namaz. Is it permissible to perform the missed sajdah sahw of the sunnat namaz after the fardh prayer?

Issuing talaaq using the word "Azaad"

Q: If the husband didn't use the word talaq instead he said 3 times "ma tmhy azad karta hon" is nikah still valid? Next day he said "meray kehnay ka matlab tha ka tum azad ho jo marzi karo ma kuch ni kahon ga" and after few months he again said 1 time through text msg ka "azad ha tu" please I m very upset reply me as soon as possible. He is still my husband or not?

Wazifa for safe pregnancy

Q: I had a miscarriage in April due to no baby heartbeat. Now I conceived again Alhumdulilah but yesterday I went for ultrasound and they said that there is a baby without foetal pole and they said that I should come back in a week to check the baby's heartbeat again. Please suggest any dua which I can recite and Allah give a heartbeat to my baby and I will be safe from miscarriage. 

Men and women's clothing

Q: Why are women said to wear burkha but men aren't. And how should a Muslim man dress? And like if I like a sweat shirt am I allowed to wear because the sweat shirt(not body tight) can look good and still attract the opposite gender. So is that permissible in Islam, to wear nice clothing?