Could my body be playing tricks on me?

Okay so my boyfriend and I aren’t ttc but we aren’t stopping it from happening either. If it happens, it happens. We had sex almost everyday this past month, so obviously that’s a huge factor but I feel like my body may be playing tricks on me? I’ve been having some symptoms.

1. I have Heartburn like crazy

2. My nipples are sore and my boobs feel heavy.

3. My lower back hurts and I’m cramping

4. I feel like I’m gonna puke (not in the mornings. Random times but it comes and goes in waves)

5. I was supposed to get my period yesterday.

I feel like most of these are just PMS symptoms but I want to get opinions on what you guys think. Also, I have not had any spotting and I know that’s a sign of pregnancy.