I think I'm pregnant

I still have my periods but there shorter then I normally would have my periods. My period is normally a week and a day but now it's on 4-5. I had unprotected sex on March 10, and took a test a month later and it came out negative. But, I been feeling nausea a lot, having stomach pains, I can sleep for a hour or two and be ready to go to sleep for another nap in 10mins, I keep getting a tingle feeling in fingers. Could I be pregnant?