| Linda,
Vaginal discharge is always normally present in some amount or the other in most women.
In a normal menstrual cycle, the discharge is minimal immediately after the period is over and then increases gradually in amount to reach a peak around 12 - 16 days after the period. Then the amount of vaginal discharge decreases and almost disappears for about 10 days. The discharge again increases slightly 1 -3 days before the period starts.
If your vaginal discharge more or less follows this cycle, then it is normal discharge, especially since it is whitish and does not smell or itch.
Thrush will cause clumpy discharge and severe itchiness.
You can read more about normal vaginal discharge here:
Normal Vaginal Discharge
The stabbing pain that you occasionally get during intercourse could be because the penis touches the uterus sharply at times, especially if your bladder is full at the time and your uterus pushed backwards. If you do not get the pain at other time, it is not something to be concerned about.
I hope this helps. Please feel free to ask a follow-up question if you need more information.
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