I came off bc at the beginning of June I have had three periods my cycles are short I bleed for 4 days and have a period two weeks after the last period ended I used two different <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">period tracker</a> apps on my phone and it says on one app my fertile window is today and on the other app it says it is in two days time I have had sex several times yesterday I am not sure when I'm ovulating as the dates are different can I still get pregnant a few days after sex