Painful 😣

Me and my boyfriend had sex today “ unprotected “ we been trying to conceive but anyway after sex I had lower abdominal pain which I NEVER have had before and it happened again 10 mins ago after intercourse so I went to take a warm shower and it went away I haven’t had a period this month my “ glow “ app says I start tomorrow but the month before I started on the 27th 28th my periods are irregular but I always had a period a month. Can someone tell me what’s wrong 👀