Possible pregnancy? (TMI ish)

For the past week I've been have cramps. My period is 5 days away. Ths past two days when I've wiped I've had a sort of brown discharge but only really in the morning. I've been kinda nauseous when waking up and after eating. Certain smells have made me actually gag, smells that before never bothered me. I've also been using the bathroom a lot and constantly feel the need to pee even when it's the littlest bit. I have unprotected sex 3 times this month and my before came inside me. I'm not on birth control and were not trying for kids but we both agreed in the past if it happens it happens. I'm a very nervous person so I could just be overthinking it though.