Hello mam,
I started my period on 7th of April and was bleeding till 9th of April.I had intercourse on 15th April with condoms and my partner say he did not ejaculate inside me even in the condom.

I had muscular pain after sex in my thighs and now i.e on 20 April m having a white sticky discharge with pain in my abdomen like we have during the periods.am I pregnant by any chance?how can I know please help

If you have any doubts you will need to consult with your own medical practitioner for a blood test or try a home test first.

Too early to tell, sounds more like an infection from the pain, since pain is not normally a sign this early. But only your doctor can tell you for sure after exam.