TTC while breastfeeding

I am still breastfeeding my beautiful 13month old son who doesn't seem like he wants to stop anytime soon 😅. I have been waiting for my first pp period to start so I can start trying for another baby but it has not came back. I wanted the siblings to be very close in age. On Oct. 21st my husband and I DTD and I have been feeling differnt since. My breast the next day were huge compared to everyday. I feel bloated and so much cramps and lower back ach. I also have been getting headache and broke out a few on my chin. (I haven't got a pimple since having my son) I also feel bubbly feelings  in my uterus. Is it to soon to have all these symptoms? 7 days after intercourse? When should I do a pregnancy test ?