Pregnant?

(F, 17) Hi, I'm recently new to sex and my period was supposed to come but it didn't. I'm 7 days late and My uterus has been hurting since my first day of no period. I took a pregnancy test and it came out negative. My uterus is back to normal after two days but I'm very gassy and cramping. I have been stressing because of the thought of being pregnant and I've had a lot of testing this week. An older friend told me when you first have sex it can mess with your cycle schedule. 

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