I need some help

Hello, I kinda need advice. I’ve been having low iron lately and I’ve been feeling slightly nauseous and my breast feeling sore. What can that be a sign of ? I just had my period so I’m like a little confused on what it might be, and haven’t had sex since the 1st of this month. Could I be pregnant? Also please understand everybody is going through something one way or another so please comment nice and helpful advice if you have any because lately when I post something on here it’s rude comments or makes me feel dumb for asking questions, even though everybody has their overthinking situations that they need advice for, so please be respectful. Thank you