Unprotected sex with my partner

Weird question,..
Can someone help me please?
I've been having unprotected sex with my partner nearly everyday for a week. I'm not due on my period till the 6th of march ish. But I've been throwing up and having bad bellyache. Also roughly about 1 hour after sex I've been desperately needing a wee.
Could this mean I'm pregnant? 
Also, when is the soonest I can do a pregnancy test?

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