I quit taking birth control on July 5th and I had my period on July 9th, it lasted for thee days. The day it ended my husband and I had sex. About 5 days later I began feeling sick, throwing up unexpectedly throughout the day, especially when I smelled things, I have been extremely tired and sleeping more than usual. I have gotten headaches like no there like 5 or 6 of them throughout the day, and also had some slight cramping in the lower abdomin. That all has stopped for the most part, well I have felt OK for one day so far. Then yesterday I was spotting but it was just a light pinkish with some brown and a couple of red spots. That has been going on for about two days now but it doesn't last the whole day just a couple times throughout the day. Then today we had sex and it was very uncomfortable, like I was very sore and it wsa a slight pinch every time he thrust in past a certain point. I have never had any problems with sex before and after doing it for a couple of minutes it went away. What could this all be? Could I be pregnant? Or could it just be my peiod? But I thought it would be too soon to be my period because I just had it on the 9th of July and it is only the 21st of July

Pregnancy is possible, some women conceive right after coming off the pill... but it can also be your body getting back to normal after stopping the pill and this can take a few cycles for some women. Would be quite early to be feeling ill due to pregnancy, could be you just happened to have a stomach bug since it is subsiding now.
See what happens when your next period would be due... if your periods are still off, and/or if you still feel ill now and then, try a pregnancy test.