I had sex maybe 2 weeks ago , I’m now

Patient: I had sex maybe 2 weeks ago , I’m now experiencing spotting a week before my period .I’m on birth control, but i had changed the day that i normally would change the patch to a different day .. could that be a reason why ? I also recently got switched from Ortho Evra to Xulane , the reviews on Xulane stated that it caused spotting , cramps , blood clots .. etc .. I’m just wondering what’s going on.

Symptoms: Spotting , cramps

Doctor: