So me and my fiancé were on vacation in mexico in January. (Last month)
We had unprotected sex on Sunday January 13th . I started spotting on the 19th
Then finally got my period on the 21st which was light not like my usual period. I usually have a very
Irregular and heavy and painfull periods and when I do usually get it. It lasts up to two weeks.
This one was only four days long and painless. I took two pregnancy tests. One test I took was two weeks
After intercourse then three weeks after intrrcourse. They both camr up negative. But I feel pregnant.is pregnancy even a possibility?

If you have sex, there is a possibility of becoming pregnant. Sounds like you got your period. Wait until next month's expected period. If you miss it, wait two weeks, then test with your first morning urine.

That's the hard part my periods are so irregular. I have gone 7 monthes without getting it one time.

Thats the hard part my periods are so irregular. I have gone 7 monthes without getting it one time.
You may need to see a doctor for a blood test then.

You needed to have waited to at least 2 weeks after your "light period" to test, which would be now. So do a new test tomorrow, use the first urine of the day as soon as you wake up