Period or pregnant

So I ovulated on the 14th of January and on the 28th I was supposed to get my period but I had one one light/spotting day on the 29th that was it so I tested and it was negative. So I waited for my next period no sex all month because my husband is at ALC so I wanted for my period on the 28th of February and it was spotting then the 29th was medium then the next day nothing took a test said negative. Not sure if it’s my body stressing out I’ve been having back pain and pelvic pain like I did when I found out I was pregnant with my daughter as well as headaches for a month straight but idk if this could be something else. And advise or input. Thank you 😊