"I've been dizzy, nauseated,and have had a loss of appetite lately as well as very fatigued. I haven't missed any periods however I am on birth control and I'm sexually active. Should I take a pregnancy test just in case?"

Yes, I suppose - or go have a checkup and blood panel.
The only 99.9% effective BC is the patch.
Even the pill and tubal ligation are lower.
Condoms and so on are very low!

The only 99.9% effective BC is the patch.


Please quote your sources.

http://www.americanpregnancy.org/preventingpregnancy/birthcontrolfailure.html

It conflicts a bit with other sites like Planned Parenthood (which rate the pill and patch the same), but all statistics about birth control are not that easy to collect.