How to know when to test when your unsure when your period will begin?

I haven’t missed my period yet to this app it’s suppose to come tomorrow but last two months I had 26 day cycles.

I haven’t really had pregnancy symptoms. I been crying a lot more but that can be due to stress and I was spotting after sex for about 4-5 days it randomly stopped so I had small amount of discharge this morning. I also been sleeping a lot more but at the same time I’m not tried even tho I been sleeping? Like I take a lot of naps almost everyday.

I took a pregnancy test Sunday almost at midnight but it came out negative.

Test up above^

Should I wait to take another one or just forget about testing because it’s not possible I’m pregnant?