TTC and wondering able possible early signs

My bf and I are starting to try and conceive. My ovulation day was yesterday. Over the weekend we made love 8 times to try to increase the chances. I know sperm can live in you for 3 to 5 days so could there be a chance that I could have conceived the next day when I was expected to ovulate. Also, what are some early signs of pregnancy and how early can you start to notice? I've been having slight cramping in my abdomen, fatigue, slight dizziness for about 10 seconds today randomly, feel bloated, slight lightheadedness and constipation. Could these be signs? I just feel different.