Can i be having symptoms already???

My husband and I had sex on the ninth of Feb( i was on my period 4th day) and we use the withdrawal method ( which has worked for us for 5 years). Afterwards he was like I think there's a 10% chance I came in you. I blew it off. My cycle is short at 25 days and Glow has my ovulation predicted at right after my period.

I am now experiencing horrible nausea, dizziness, and usually my boobs hurt intensely the week before my period but I have had no pains, also I am experiencing slight cramping as well.

Are these early signs or just me overreacting???