Am I wrong?

Erin • Mother To An Angel Baby 👼🏾 1/16/18-1/20/18, Rainbow Baby JGC 🌈, and now our 3rd charm baby ☘️.

I was previously pregnant last year in September but I had my son through premature birth on January and he died 5 days after. I’ve grieved and gotten at peace with my son being with God. So now, me and my boyfriend had sex the day before and of my ovulation and since then, I’ve been feeling this pain on my right side. I was nauseous but it went a way the next day. But I still have this pain. And now I have mysterious fluid discharged that just came. I had took a test but it came out negative, and I figured because I did it early. Had anyone had a tender or sore right side of their uterus before? Asking for myself.