I had one day period, when I can do the test?

hi, my last period was last december 10, 2015. My bf and I got into some a little bit of fun. He fingered me and I squirted and then we masterbated together. He came and went to wash his hands then came back and fingered me. He said he really did wash his hands. Now,I was expecting to have my period on Jan 8 to 10 but, it never came. The next week, I found a tiny clot of blood inside my vagina and that that I was going to have a period yet, there was nothing. My bf kept telling me that I would have my period because he is sure that I am not pregnant. But, I'm really afraid. Is there any poaaibility that I am pregnant? I feel bloated. I am chubby anfld have belly fats but my belly is bigger and kinda hard. I have a problem pooping but, Im confused weather this is an attribute to ptegnancy. Am I pregnant? Do I need to worry? Please give me aome advice. Iam 21 yrs old. My period is sometimes regular for 6 months or so and then irregular at random times. Please tell ne if Im preggo. I can't visit a doctor to consult for pregnancy because it would be a shame to be pregnant at this age in my country and family. Also, Im really ashamed to buy a PT kit. PLEASE HELP ME.