Could i be??

Camillia • Thought I could never have kids but god blessed me with a beautiful son September 23,2013
I had sex 4/16/2017 unprotected and he came in me...my period came on 4 days later then I sex again 4/30/2017 unprotected and he came in me... All my apps (which is alot lol) tell me my period should have started between 5/18-5/20. Could I be pregnant?? I've been sleepy alot,peeing alot, hungry alot,etc. I even noticed a few days back when I wiped I seen some streaks of pink on the tissue....I have been stressed and depressed sort of but could you still have sex and get your period 4 days later be pregnant??