Pregnancy Possiblility?

So i need your ladies help on this one. Last month I had my period on the 18th. This month, Glow predicted the 24th for my period to start. I had sex 2 days within my fertile window, 3 days before possible ovulation, and on the day when i could have possibly ovulated. Me & Fiancé use the withdrawal method so we are protecting but not preventing it either. Today i am 2 days late for my excepted 18th of this month. I don't know if Glow predicted right but i have been having symptoms of PMS or what can be early signs of pregnancy such as fatigue (falling asleep earlier than usual), little nausea, swollen sore tender breasts/nipples, bloading, frequent peeing, mild pelvic & abdominal cramping, & back pains... could this just be PMS or could I be pregnant? Will it be wise to test now or the day before Christmas eve?