Is it possible i’m pregnant ?

So I had a few questions. Do you guys think i could be pregnant? On the 13th I had unprotected sex but he didn’t finish inside me. On the 16th he did, took plan b but am over the weight limit so i don’t think it would work and it was also in my fertile window so after ovulation most likely. I wasn’t tracking when I’d exactly ovulate(like the day) but i have been keeping track of my bbt. On the 17th it was 99.8, 18th 99.4, and today 98.9 and now it’s back up to 99.6. I had some milky CM on the 18th. I’ve been nauseous, having back pain, indigestion, frequent urination, constipation, darkening of nipples, and sensitive to smells and what not. I go take a pregnancy blood test on the 26th. But i just feel pregnant. is there anyway?