Could I be feeling symptoms already?

I think I am about 4-5 dpo. I have been feeling extremely tired and feeling a lot of "pressure" in my lower abdomen. It's not cramping but it just feels kinda "heavy" down there. No other symptoms. We bd the 2 days prior to OV and the day after, but not the day of OV. What do you think my chances are? Could these be symptoms this early? AF is not due for another 9 days. Thanks and baby dust to all!