So i had sex on my period... i know i know

So i started my period on Oct 11th and i had sex with my "friend" on Oct 13th. We have been messing around for a month now, of course not every day but quite often.. He has about 9 kids and is 42. And yes he does take care of all of them financially and so forth. Well before i started my period we messed around like sooo much sometimea several times a day and he came in me. Initally i was told he got "fixed" but then later told a bunch of lies and realizing he never did get "fixed" he told me that he wanted to have a baby with me we would be great parents blah blah blah but doesnt want to be attached to someone right now which is backwards asf!!! So i kinda go tricked.. After he came clean about everything and i started my period and told him he sounded hurt. He asked me whats wrong why am i not pregnant. I have pcos and he doesnt know so i know thats most likely the reason. The day we had sex i douched which i typically dont do but didnt want "ketchup" everywhere lol. So now today is the 18th and i have been cramping and feeling pressure in my pelvis as if my period is starting again but i know its not. Im not sure what it could be i usually dont feel like that unless its my period... I have hears that women arw fertile on their periods bc their cervix is open but i couldnt possibly be pregnant right? I mean 5 days after sex and having cramps and pressure what could it be any body have a similar expierence? And suggestions or feed back? Im not looking to be judged or ridiculed by anyone therefore if you dont have anything nice to say and only have rude or disrespectful things to say please do not comment. I just really want to know what it may be. I dont know when i ovualte bc i have pcos but i typically know my ovualtion pains whenever i do ovualte.