Pregnant or my period? Plz read

Could I be pregnant i know it can happen sense I use the pull out method but how likely? my boobs have been super sensitive and haven’t had a migraine or cramps like I normally do leading to my period? Glow said I should start my af on the 29th but <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> said the 27th, but it always comes on the 26th of each month? What do you think?