I can’t be pregnant 😩😅

So I know most women come on here asking for prayers that they ARE pregnant but I would like to ask everyone to pray for me that I’m NOT pregnant 😂😅 so basically my fiancé and I just had our first baby 3 months ago. I haven’t had a normal period yet so I have no idea what my cycle is or anything. Im breastfeeding so my sex drive is like completely gone right now but a week and a half ago we were both drinking and things got a little carried away and we ended up having sex without a condom 😩 so he pulled out. I didn’t really think much of it until a few days later when I got randomly nauseous. Now I’ve been getting nauseous at least once a day and I’m scared I could be pregnant again. I know nausea can be caused from lots of things like the fact I work in retail and don’t get a real break so I don’t eat a real meal until I’m home. But with my first, nausea was my first symptom and was EXTREME throughout the whole pregnancy so that’s why it worries me. Lol another pregnancy and another baby right now is just not what we need. 🥴😅