Well I Had Sex On The 26 Of December And

well I had sex on the 26 of December and also on the 28 when my period came on.He did get off in me both times.my period stayed on like it should for five days then after all this I start having headache,bloating,mood swings,nausea,urination,tired,backpain,pelvic pain,abdominal pain,appitite,i have taken a pregnant text it was negative but its still not time for my period for January but I had 2 in December the frist of December and the last that went off January the1 can I still be pregnant