Could I possibly be pregnant?

Anonymous
Lately I haven't been feeling my self. The other day when I woke up to work I felt super nauseous and I felt nauseous and I had a headache through out the rest of the day. Ever since then my stomach has been a little upset every now and then and I get a head ache every now and then and sometimes I even get a little dizzy. I went to my doctor yesterday and he told me I probably have a virus my body is fighting off or its associated with stress. I also have been really irritable lately and I rarely get mad at people or irritated easily. I'm on birth control and I had sex with my boyfriend a couple weeks ago unprotected, but I always take my pills on time everyday. I took a "first response" pregnancy test the other night and it came out as negative, I only took one. I also read on the box after taking it that the test can sometimes come out negative if you use a contraceptive pill and since "first response" is suppose to be used before a missed period, because of my birth control I don't have a period. Could that have messed the test up? I don't know if I am, really pregnant, stressed out, or maybe it's my birth control acting up. Can you help please? *I've been feeling this way for 5 days now*
Could I possibly be pregnant?
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