Nausea After sex?

Ciara • Mommy to Shellie Grace and Ready to meet Tracyn Wayne💜
Hubby and I have been TTC. I am just now getting over strep throat and the flu. I had both at once. Since I was feeling a lot better, and was Kinda in the mood 👅 We decided to go for it. However, after having sex, I got seriously nauseated and bloated. There was also some spotting afterwards. This has never happened to me before. Should I be worried? 
The app tells me I could test today, but it's a couple days before my period. 
UPDATE: It happened again. I spotted a little last night also. Took a test; it was negative.