Unsure

I had been ttc for a few months now. And I know this is not a symptom as I only ovulated today. But I was wondering if any one else gets nauseous after sex. Me and my partner had sex about 3/4 hours ago and I’ve been nauseous from about half an hour after til now and it’s just getting worse. I haven’t had anything like this in previous cycles. My partner said it might be stress but I’m not really stressed any ideas of the cause. Or anyone who relates?

Any ideas ?