Anyone experience vaginal bleeding or spotting during their pregnancy?

Elsa • 36 gave birth to my #1 in 2017, married since Oct`13. Hoping for baby #2 but yet to try.
Im so scared! My AF is late since 8June, my 15DPO. I got a faint line on the pregnancy test kit on 11June & I plan to take the test again on 15June before I consult my TCM; chinese traditional doctor. But on 12 & 13 June there are some spotting (like blood) on my panty. I'm concern that (1) im not pregnant & my AF is late, (2) miscarriage, or (3) just common sign during 1st trimester, consult TCM for some tonic to assure the growing foetus inside of me.