pregnancy symptoms?

Okay, so my boyfriend asked if I was pregnant, I think I'm not but he isn't too sure because of these symptoms. Don't want to buy a pregnancy test as I'd rather get advice from you guys first.. so...
- nausea 
- headaches
- increased appetite
- 'cravings' and I've quoted it as that's what my SO has called it- I just think I fancy that food at that particular time. 
- lower back pain -specificially left side
- constantly tired. 
now, I'm on the pill and I have unprotected sex and I also just had a period, but I know it's unlikely but still happens that you can still have a period when pregnant. 
I don't want to seem that I'm wasting people's time... so no hate please💙💙

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