Missed period

So I’m almost 3 days late, will be 3 days tomorrow. I’m at a loss because this isn’t a normal. I’ve taken 4 pregnancy tests all being negative. 2 of the tests being the first pee of the morning and then the others in evenings. I’m NEVER late, Im always early or have my period the day the app says. I have an app that I use to track everything. We only did the “dirty” one time last month on according to the app on an ovulation day. Should I go to the OB if I don’t have a positive in the morning? I’ve felt nauseous, & tired. But I could be tricking myself 😭 Hopefully someone can help, cause I’m a little freaked out. In my past pregnancies. 2 miscarriages & 1 successful I’ve typically always tested early.