Fiancé said my BJ's don't feel as good as they used to?

Tonight he told me my blowjobs are sucky now and he got frustrates when i tried to finish giving him one today. We had just gotten done with sex and my P hurt so bad I couldn't get in the mood when hr wanted me to. He went to bed huffing and puffing and pissed off and won't talk to me. Is he tired of me? The only thing sexual he wants now is regular sex. No oral or anything. He went from saying i give amazing head one day to sucky head the next. Im up crying (partially because of pregnancy hormones) because im afraid hes gonna leave me if sex ever gets sucky. My ex left me after being together a year and turned out he was FWB with a chick the whole time.