I had sex 4 days ago and now my lower stomach and lower back have been hurting.

It's too early for pregnancy symptoms honey. It takes at the very earliest 8 days for pregnancy symptoms to pop up as implantation has to have occurred to get symptoms. It takes at least (usually more) 3 or 4 days after implantation to get symptoms. Implantation occurs 4-16 days past ovulation, with 4-6 days being rare.
 
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