Hello, my boyfriend and I have had sex 4 times between my last period and two weeks ago. Everytime we had sex, we used a condom. 2 or 3 of the times I asked him to pull out before he ejaculated and he did. I use a period tracker app to help keep track of my periods now that I am becoming intimate. It's been pretty accurate the last few months I have been using it. My last period was on Feb 17 amd my periods are usually 27 days apart. I was supposed to start March 17 and I didn't. I am now going to be 2 days late. Let me add that usually before I start my period I begin spotting for a few days. I have seen no signs of spotting yet. I am not on any birth control and my periods are pretty irregular but the app says my average time between periods is 27 days. I am going crazy. Could I possibly be pregnant? I have taken 2 tests thus far and they both are negative. Should I be concerned? This is driving me nuts and making me stressed which I feel is delaying my period further. Please help!