Devastated

My period is 3 days late. My partner and had unprotected sex on the second last day of my fertile time and I had some extremely light blood in my discharge that has stopped.We already have two children and agreed that is all we want. I've been tracking my period with Glow going on 7 months and previously been on Depo shots. He will be so angry if I am pregnant.Am so upset. Having already had a termination early in our relationship I never thought I'd have to go through another one. Please help Glow.