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Hi and thanks for the query.
At 27 weeks there should be no pregnancy related adverse effects of taking one Fioricet for the migraine. It would be better than to get an injection of Sumatriptan as safety of sumatriptan in pregnancy is not established and there are reports of miscarriages.
Hope this helps.
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Yes, I am sending two links.
1) Sumatriptan - http://www.drugs.com/pro/imitrex-injection.html
2) Fioricet - http://www.drugs.com/pregnancy/acetaminophen-butalbital-caffeine.html