Could I be pregnant?

At the end of April I got my IUD removed due to issues after having it for almost 3 years. I chose not to start a new form of birth control because I've tried most of them with no success and wanted to take a break.

Me and my boyfriend don't use condoms and just decided we'd be extra careful. For a while everything was going well. I got my period as normal May 21st and it lasted about 6 days. On June 6th, me and my boyfriend had sex as normal but this time he came inside of me. According to my eve calendar I was in my ovulation window though the percentage was only 8%.

Because of my IUD I'm not sure if I have a 28day cycle or if mine is irregular. I started using this app a few weeks ago so that I could understand my body and my cycle better. But for the past 3 months I've gotten my period around the same time each month.

It's now 2 weeks later and my period was supposed to be on the 19th so if I have a normal cycle I'm 4 days late. The issue I'm having is the symptoms I'm having could easily be a case of bad PMS or early pregnancy signs.

I've been nauseous at random points of the day, constipated, headaches, fatigue, light cramping. My mood swings are getting harder to control. One minute I'm happy and in a good mood and the next I'm crying over the smallest thing. I actually have an appetite now. My breasts aren't really sore but my nipples hurt from time to time.

I've heard that after the removal of an IUD women tend to get pregnant soon after due to the hormonal changes. Is that true? I told myself I'd wait until I'm at least a week late to take one, but is it possible that I am?