Wondering...

Me and my hubby are not ttc just yet, but we're not being careful. We had intercourse on Saturday and my Glow said I was in my fertile window. I decided to start testing my ovulation to make sure my Glow was on track with my cycle and I got a smiley face on Monday night when I tested. So now I'm worried/anxious and kind of excited because I've been reading you can conceive 3 days before ovulation. Anyone think it's a good chance?