11dpo Positive.. now 18dpo 😅

Im 18DPO Im having light brown discharge for a few days now so, I got my HCG checked yesterday and its at 123 (I go again tm morning). I think im about a little over 4weeks? I only BD once on (march 26th) so, it had to be that day or couple days after. I got 4 positive Clear blue digitals and faint positives on FRER (at 10-11DPO) which was odd to me because I thought digitals needed more than FRER but Anyways! Im 101% pregnant. Ive already had my first appointment for bloodwork and such. I go for an ultrasound on monday (I should be 5 weeks by then) but, is having brown discharge normal?