Possibly pregnant

I received a visit from AF a couple weeks ago before my birthday...a couple weeks later, I'm exhausted, my lower abdomen feels a little harder, my nipples are spreading and darkening (tmi, sorry), having issues remembering certain tasks like emptying the trash or putting dishes in the sink, I cry if I drop my spoon, I feel nauseated in the late afternoon/early evening, & my husband said it looks like I have a linea negra going down my lower abdomen...I know it's not uncommon to get pregnant with AF, but how many have gotten pregnant during AF?