Going through anxiety and fear.

I have greatly sinned against God again. For the past months, I had this constant fight with lust, trying to refrain from doing sexual things including masturbation. Now, I did the deed unprotected with my girlfiend (July 2) 4 days before her supposed period. I felt guilty after that, I'm experiencing anxiety now that I might gotten her pregnant since her period is not here yet and no symptoms of coming. I need your prayers for me going through this difficult time, I've cried a lot and kneeled to God for the past few days, asking for forgiveness and her period to come. I'm asking God for signs if He can hear me or if He's there with me but I just receive nothing, and I feel so down right now. I really want to bring myself to life again, I'm shattered and has no motivation to live normally again. Please pray for me and my girlfriend, I asked God that I would surrender my relationship to Him. I know posts like these aren't usual here maybe? but I'm really feeling down right now. I've been in constant war with lust, but I kept falling, this might be my turning point. Please help me brothers and sisters..