Ovidrel

Hi everyone, I had the trigger shot last Wednesday after having my first cycle of clomid. The doctor did the scan on my 14th day and was so surprised at how well I had reacted to the clomid and gave me the trigger shot. I have been having abdominal cramps and lower back ache and feels like an uncomfortable pressure when having sex the last two days. I haven't been pregnant before so no idea what to expect is this normal or is it a sign of the injection only?