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It is too early to comment upon as you had IUI 7 days back.
It takes at least 11 days for the blood to show positive results for pregnancy
and bloating can be due to the procedure or associated gastritis
Take liquid antacid gel which acts locally and does not interfere with pregnancy.
Cold milk will help to relieve your constipation and gastritis.
Wait for another week or 10 days and the situation will be clear.