ADVICE PLEASE

hey everyone!

I am officially 7 days late with my period. I have been experiencing sore breasts, my husband says my body is really hot even though I’m not running a fever, I had light cramping today but no blood just white discharge, and my lower back hurts. I tested on day 5 at night of being late and received a negative, so I don’t know where to go from here? It was a FirstResponse so I’m inclined to believe it but I don’t know. I don’t want to get my hopes up just to not be pregnant

My husband and I have been trying for 14 months with no luck just as reference.

Please let me know what you think I should do next! Thank you!