Pregnancy symptoms or idk help

I was on the implant birth control, i was constantly bleeding, i switch to depo, i was told I’m fertile as soon as implant was removed but it would take the depo 7 days to kick in. Me and my boyfriend still proceeded with unprotected sex so i told him you know pull out, he did but one time he didn’t, i got a plan B about 1 hour later, i stopped bleeding 2months into me having depo, i got my shot renewed (every 3 months). This is my 4 month on depo, still no bleeding, but now I’m experiencing nausea and like I’m freezing cold all the time and every one around is saying they’re hot (it’s summertime) not sure would be a first time mom ……….. help