Am I possibly having reoccurring chemicals?

My husband and I have been not trying not preventing for a year, and have decided to start trying officially two months ago. I’m 23 and he’s 27.

During our NTNP phase, there were two times where we got drunk and he finished in me. There was a good chance of pregnancy based on where I was in my cycle.

Both of those times, I felt off maybe 9-10 days later. I felt horrible and early pms symptoms and cramps. My cycle has never been irregular. When this happened, I would begin spotting 8-9 days before my period. And had a short light brown “period”.

I chalked it up to a coincidence. But every time we have “tried”, my period and my body gets out of wack. I feel it. I spot. I get extremely emotional.

This time, I took a test and it was a very very faint line. Two days later (today) the line disappears.

Is it possible I’m having chemicals? For ladies who have, what were your symptoms? What did you do?