Pregnant?

Suspected fertile week was oct 14-20. We had unprotected sex on the 13th and he wasn’t confident he pulled out entirely. On the 14th we had sex and started without a condom but put it on before he finished. Same with the 20th. My period is due tomorrow and two days ago, I took a test after I got off work (I had peed like three or four hours prior so maybe it wasn’t concentrated/early?) but it was negative. Yesterday I felt a little crampy and my boobs hurt so bad, but today no sore boobs. I did get super nauseous and dry heaved in the toilet for about 20 minutes but it’s since gone away aside from some nausea. I did drink last night but just a tall boy simply lemonade and maybe three shots and I’ve never gotten sick from drinking especially when I didn’t have very much and slept it off hours before dry heaving. I haven’t really had much discharge this cycle, but lately it’s very watery and clear. My period tends to be at most 3 days late, so I really don’t want to convince myself I’m pregnant and I want to believe the negative test I’ve already taken. I work nights and my sleep schedule is so choppy that I’m not sure when the best time to take a test would be if it’s still early for hcg to be concentrated enough, but I plan on getting a cheap test later today. I guess my question is, is all this just a coincidence? Or could it be real?