Help! Birth Control question...

Brittany • Brittany • 24 • Tom is my saving grace. I love you <3 6.30.14 <3
Long post... Sorry for that...
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I am taking Lo Loestrin Fe.
For all of u who don't know Lo Loestrin Fe has 26 active pills and 2 inactive per pack. 
It is also known to be one of the few brands with the lowest hormone percentage.
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Ok so I am now in the first week of my second pack
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First pack didn't get a full on bleeding period. Just heavy and light spotting towards the last half of the pack
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This past week I've been pooping a lot and have extremely bad gas
Bad headaches
No changes in my breasts
Boyfriend and I read pill is effective after week 1 so I had him finish inside last night
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The fact that it was just spotting at the end of pack one. Should I take a preggo test? 
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Also before u answer that I read it's normal to skip periods on this brand.