NO SEX BUT PREGNANT????

On Jan. 21st I had direct genital on genital contact with my boyfriend. We didnt use any sort of birth control. There was no penetration and he did not ejaculate- and to our knowledge, he didn't precum. His penis was not in contact with my vagina for too long. Maybe 7 minutes or so- on and off. 
Jan. 21st was also the first day of my last period. I had a full, very normal period. I have yet to start my period which makes me about 3 days late. 
My breasts have been incredibly sore which isn't that unusual from my normal period symptoms
I have also been experiencing some light cramping which I also usually get around my period- but it still isn't here. 
I visited a women's care clinic and I got a pregnancy test 2 Friday's ago. The nurse did tell me that the negative I received could've been false because of how early to took the test (about 2 weeks after the contact). He and I haven't had any sexual contact since then. 
Am I just crazy??

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