A pregnant woman feels nauseous all the time – how should she pray?
Question

                I have a few questions regarding pregnancy and prayers . When a woman is pregnant, especially in the early stages, it is quite common to feel ill.  I am in the first months of my pregnancy and have nausea all day long.  What is the ruling on a woman praying when she feels ill?  Can she join prayers?  Can she sit down while praying (in case she feels much more nauseous when standing)?  When I currently pray standing, I must do so quickly for fear that I will become sick and this causes me to not have the proper attention in prayers.
Praise be to Allah.Firstly: 
          it is not permissible for a Muslim to forego prayer no matter what the 
          situation. But if he is sick, then he should pray according to what 
          he is able to do. So he should pray standing up; if he cannot do that, 
          then he should pray sitting, and if he cannot do that, then on his side. 
          The evidence for that is:
1 
          – ‘Imraan ibn Husayn (may Allaah be pleased with him) who said: “The 
          Messenger of Allaah 
          
          (peace and blessings of Allaah be upon him) said: ‘Pray standing, and 
          if you cannot, then sitting, and if you cannot, then on your side.’” 
          (narrated by al-Bukhaari, 1117)
2 – It was narrated from Jaabir (may Allaah be pleased 
          with him) that the Prophet 
          
          (peace and blessings of Allaah be upon him) said to a sick person who 
          prayed using a pillow for rukoo’ and prostration “Pray on the ground 
          if you can, and if you cannot, then tilt your head, and make your sujood  
          lower than your rukoo’.” (Narrated by al-Bayhaqi with a strong (qawiy) 
          isnaad, 4359. Classed as saheeh by al-Albaani in al-Saheeh, 323). See 
          also Question no. 7522.  
Secondly, 
          although you say that you feel nauseous during pregnancy, this should 
          not prevent you from doing the prayers; even if you feel nauseous when 
          you pray, this does not invalidate your prayers. 
Thirdly, 
          can a woman join prayers if she finds it difficult to pray each prayer 
          at its own time?
Examples 
          of difficulty include travelling, sickness, rain, mud and intense cold 
          wind.
But 
          shortening the prayers is only permitted when travelling.
This 
          woman who feels nauseous when praying will be rewarded in sha Allaah 
          for striving to pray when she is in this difficult situation. Whatever 
          she suffers of pain and exhaustion in her pregnancy will also expiate 
          for her sins, because the Prophet 
          
          (peace and blessings of Allaah be upon him) said: “No fatigue, no disease, 
          no sorrow, no sadness, no hurt, no distress befalls a Muslim, not even 
          the prick of a thorn, but Allaah expiates some of his sins for that.” 
          
(Narrated 
          by al-Bukhaari, al-Murda, 5210 – from Abu Hurayrah)
And Allaah knows best.