Thank you for the query.
Lower abdominal pain
associated with intercourse can be caused by urinary tract infection
Pregnancy rather does not give symptoms so early so urinary tract infection seems most probable. You should also have frequent urinating, burning while urinating. Nausea
and loss of appetite can be also present.
I suggest you to have urine analysis at first. If no infection will be present, please see gynecologyst. Pregnancy test can negative in first weeks so you need to wait with it.
In case of urinary tract infection, antibiotic needs to be prescribed. You should also drink plenty of mineral water and start cranberries supplementation.
Hope this will help.