Ttc. Help

So my husband and I are ttc. Last month I spotted/ mini period or implantational bleeding  I guess. (I was so confused) for 4 days. A week before AF  was supposed to show up. AF is supposed to be here soon. But lately I have been getting like period cramps which is weird never has happened. I think I could be pregnant. What do y'all think? What symptoms did you have before you found out?