trying to conceive

Ha
So my boyfriend and I are trying to conceive, last weekend was my fertile window with ovulation on 13th, we did it every night that weekend and day of 13th. It's now 5 dpo and since 2 dpo I've felt nauseous, light pain on my left and right side, sore breasts, and low back pain. My period isn't due until Feb 28th. Could this be a sign of early pregnancy?