Am I Pregnant? Please please read!?

I had unprotected sex a few times about three- four weeks ago with my boyfriend. He never came in me but now I think my period is late. The only reason I say think is because I can't remember when the last one was. If it was around the 6th or the 16th, either way it would be late right? Well now this week has started and I always want to sleep, yesterday I took a two hour nap, the day before I did the same in the middle of the day. I'm always hungry 20-50 minutes after eating a big meal, and I'm grumpy! I had a feeling of nausea the other day but no puke. Is this just my period coming or something else?
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Am I Pregnant? Please please read!?
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