Opinions on testing

My period is two days late, I’m not really having any signs of anything. I’ve just been really moody up and down.. yesterday my boyfriend asked aren’t I supposed to be on my period? He knows it better than me! Lol!! but the thing is I’m becoming more and more irregular so it’s hard to say it’s not just late. I did have unprotected sex a couple times, so I tested yesterday and I didn’t see anything. Although someone did the invert colors on my pic and said they see a vvfl. I used the 88 cents Walmart one. Is it worth it to go buy a first response and see? Or should I just believe that test I did already.. ? Thanks guys