Is it possible to have pregnancy symptoms @ 7 or 8 dpo?

I am either 7 or 8 DPO. I had horrible cramps on both sides of my abdomen and both upper thighs for about 2 days during the time I was ovulating from Sunday until late Monday (+ opk very early last Sunday morning which was no longer positive by 11am).

Since Friday I've been having menstrual like cramps. When I checked my cervix Friday I got pinkish blood on my finger, yesterday I got brown blood on my finger. There is no longer blood present when I check my cervix.

I started getting nauseas and had diarrhea last night. This morning the nausea is worse and I vomited a small amount. I also had some diarrhea again and a migraine.

I'm not one who has experienced ovulation pain or implantation symptoms before. I rarely had morning sickness with my 4 kids. So this is all new to me.

Do you think it's too soon to be experiencing pregnancy symptoms??