My period came lighter than usual but it did filled several pads and lasted 4 days, however I do see some changes on my nipples: they look a little dark sometimes and they just look odd. Today I'm on my last day of period with brown discharge (regula on all my periods). Is there a chance I'm pregnant. (Period blood was really red). And Everytime i think about it I get super stressed and i don't know if I'm imagining feeling like a stomach ache or something, and my boyfriend thinks I'm stressing over nothing. I'm I nuts, or I'm I pregnant?