I am Dr Mittal.
I have read your message.
I think I can help you.
First, if you have used protection all the 3 times , it is highly unlikely that you are pregnant. The protection devices like condoms and diaphragm are known to have high failure rate but the chief cause of the failure is rupture of the device. So if your device was intact all the three times, pregnancy
is not possible.
Second , the cramps in abdomen are usually due to the remodelling of the female genital tract. It's definitely not the implantation
if that is what you are thinking.
Further, in view of the abnormal menses that you are facing , it us highly unlikely that you have a viable ovum at the time of intercourse. The ovum is released commonly on the 14th day of the cycle and is not re released till the next cycle. Now the exact information is not available from the query, but it is suggestive of the above mentioned possibility.
So overall I think it is highly unlikely that you can be pregnant. Still , I would suggest testing a urine pregnancy test. These are cheap and commercially available and usually have a decent reliability.
I have tried to make it as simple as possible. I hope that the information contained in this message will be able to help you find the best solution for your problem. Please feel free to contact us for more information. Best of luck. Dr Mittal