Did you know you were pregnant before you took a test?

Mei

So, I haven't taken a pregnancy test yet because I haven't missed my period. It should be here on the 27th but I am positive that I am. I had sex without a condom and let my boyfriend cum in me on my highest fertile day. I mean there could be a slight chance that I'm not right? Though I have been feeling pretty nauseous most days and feeling more fatigued. I want to take a test but I feel as though its too early since I haven't missed my period yet, has anyone else felt pregnant before they knew they actually were?

(Update)

4/27/19

So I just got my period but there is still a chance that I'm pregnant right? I mean she came right on time but some women get their period while testing positive for pregnancy....